One Won't Leave the Cuckoo's Nest

Fandom: South Park

Pairing: Thomas Tucker/Tweek Tweak, Craig Tucker/Tweek Tweak, Stan Marsh/Tweek Tweak

Rating: R-18

Genre: Het, smut, drama, NTR

Warnings: Age gap, genderbend (fem Tweek), cuckolding/NTR

Chapters: 1/?

Summary: After Craig leaves South Park for college, Tweek is struggling with loneliness in their long distance relationship. However, she finds comfort from Craig's divorced father.

I wanted to try writing het smut and as an NTR enjoyer I like Theek, so I came up with this fem Tweek story. It's only one chapter so far, but I do want to continue it at some point and I've had almost finished second chapter in my drafts for quite a long time. The purpose of this story is mostly erotic, but there's some drama too. Craig's dad comes off as sort of ugly bastard, doesn't he? In season 20, there's a scene where his wife comes crying to Kyle's mother because she had found out her husband browses infidelity and porn sites... The nerve he has!

Chapter 1/?

”Tweek, I appreciate your help, but you shouldn’t waste your weekends with an old guy like me,” Thomas Tucker said as he watched his son’s girlfriend of almost 10 years raiding his kitchen cabinets. His home wasn’t exactly in top notch condition, but he was trying his best for a man of his age whose wife had recently left him.

”It’s okay, I don’t have anything else to do!” Tweek Tweak chirped back. It wasn’t a lie – her boyfriend was at college, and it seemed like he wasn’t coming back to South Park this weekend either.

”Won’t Craig come home?”

”He has to study,” she said bluntly and opened the fridge. ”Thomas, you have nothing but beer here! Are you eating properly?”

”I’ll just have take-out–” Thomas was about to explain, but stopped when he saw her taking a beer and opening it. ”Hey, what are you doing?”

”I’ll have a one,” she said.

”You’re too young!”

”What are you talking about? I’m already 19 years old and you’re my family, so it’s alright,” Tweek said as she took a sip from the can.

”That’s… That’s right,” he said, laughing a little. ”I guess I still see you as a little girl.”

Even though he was so much older than her, Tweek enjoyed the company of Thomas. He was far more straight-forward and less confusing than her own father, who often was the reason of her anxiety and frustration. When she was younger, she used to find him scary, but he actually had a heart of gold and was very supportive towards her. It took her a long time before she stopped calling him “Mr. Tucker” or “sir”, but he insisted she was his family and shouldn’t treat him like a stranger. Now it felt natural, even though the separation between Craig’s parents made her feel sad. They both were equally important to her and she didn’t want to choose between them, but these days it felt like she was keeping more contact with Thomas than his own son.

Well, it’s not like Craig had time for anyone in South Park. He was achieving his dreams in Harvard, where he was studying quantum physics with Kenny McCormick. It was a big local story that anyone who still believed in the American dream wanted to see, two working class boys from a small town on their way towards self-made success. Tweek was so proud of her boyfriend, and she wondered why Craig still stayed with her when she was a mess who couldn’t even drive a car by herself. At least she had a job, even though it was just underpaid part-time job at her parents’ own coffee shop.

“You will get an aneurysm if you keep thinking that hard, young lady,” Thomas said, interrupting her thoughts.

“Huh?” She blinked in confusion.

“Nothing,” he said and opened a can of beer for himself. “Listen, I was thinking of staying home and watching that new Japanese show Tricia keeps talking about… What was it, Kid Game? Is it about kids?”

“It’s Squid Game, Thomas. And it’s from South Korea, not Japan.”

“Yes, that’s the one! Want to join me?” He asked, and she nodded. “I’ll let you have another beer, since you’re such a big girl now.”

“I thought those Koreans were just living in poverty, but they can make some impressive stuff!” Thomas said when they had finished watching the third episode of Squid Game, making Tweek sigh.

“South and North Korea are not the same, Thomas,” she said in disbelief. He had always been a bit of a redneck, which Craig was not proud of.

“I’m just kidding. Keep being a smart-ass and you’ll become like Craig,” he said and ruffled her hair. “Let’s take a break, I have to take a piss.”

While waiting for his return, Tweek looked around the living room, spotting a photo of Laura and Thomas. They looked much younger, and Thomas still had thick hair on top of his head. Tweek found him somewhat handsome here, he was his boyfriend’s father and they had some similar features, after all. He probably still missed his ex-wife, since he kept her photo like this. She didn’t know about the details, but apparently it was Laura’s decision to divorce.

“You want to keep watching that show, or –“ Thomas was about to ask when he came back, but stopped when he saw what Tweek was holding. “Oh, darn it. I guess I forgot to put that one in the garage,” he said, scratching his neck. He sounded uncomfortable, like Tweek was seeing something she shouldn’t have seen.

”Why did she leave?” she asked, regretting it right after she saw the look of distress on his face. ”S-sorry, I shouldn’t have asked that. It’s just that Craig doesn’t talk about it with me.”

”No, it’s okay. But you’d hate me if I told you the truth,” Thomas sighed and sat down on his spot on the couch.

”I would never hate you!” Tweek protested.

”Well… I warned you, then.” He took the photo from Tweek’s hands, stared at it for a moment and finally made his confession. ”I was unfaithful. I didn’t deserve her.”

”You cheated on her?!” Tweek asked in shock. She couldn’t believe what she was hearing!

”Look, I told you.”

”N-no, it’s just –” Tweek had always thought that they had very happy marriage, that they respected each other. Thomas didn’t seem like someone who would cheat. There was sadness and regret written on his face, and she realized she didn’t want to make him feel worse. ”I just didn’t expect it.”

”I don’t mean to brag, but I have always been very virile. Our sex life was active until we had Craig,” he said, and Tweek almost choked. As much as she didn’t want to be treated like a kid by Thomas anymore, she was not prepared to hear about that. ”Then she kind of lost interest in being physical with me. I don’t blame her, but my needs haven’t gone anywhere. After she found out what I was doing through TrollTrace, I promised her I would stop, and we stayed together for the kids… But I broke my promise, and here we are.”

Tweek didn’t know what to think. That this man she admired so much was someone who couldn’t control himself at all, who instead decided to disrespect his wife. And Laura was so kind and beautiful, too. She wasn’t going to say it out loud, but she did think Thomas deserved it. He seemed to deeply regret his decision, though, so it wasn’t her place to judge him. He was still treating her well, and ever since Craig had moved to the campus she had found a new type of companionship from him.

”Shit, it’s this late?” Thomas changed the topic, looking outside. It was getting dark. ”Sorry, I didn’t realize I shouldn’t drink this much. I don’t think I can drive you home.”

”It’s okay, I can just walk!” Tweek said, wondering if Thomas was hinting that he wanted her to go home.

”Don’t be silly, it’s too late,” he said and scratched his chin. ”You could stay over? There’s lot of space in this house now, after all. And we didn’t finish the show yet either.”

”W-well, if it’s not bothering you,” she said, feeling bashful. Even though she was familiar with Thomas, she had never spent a night over without Craig being there.

”Having you over is the opposite of bothering. Craig’s room is always ready for both of you,” he said, patting her head. ”I’m going to bed now, but you can keep watching TV or do anything you like, got it?”

”Alright, Thomas. Good night.”

She watched an episode of a true crime documentary she was currently obsessed with until she started yawning, so she turned off the TV and headed towards Craig’s room. She went through his closet and grabbed his old T-shirt and a pair of shorts to wear. Craig had a bad habit of putting his used clothes back into his closet, so she smelled the shirt, hoping it would have his scent left. All she could smell was the cheap laundry detergent. She looked at herself in the mirror, lifted up the shirt a bit and snapped a photo with her phone.

Craig ❤️

Missing you ❤️

She sent the photo with a message to Craig, hoping he would get her hint this time. Their relationship had been sexual for a long time before Craig started college. They had been dating since they were 10 years old, so Tweek was surely one of the first girls in South Park to lose her virginity. The long distance relationship was harder for her than she liked to admit, not only she missed Craig every single day emotionally she was also suffering from serious sexual frustration. She had even started watching porn to deal with it herself, something she hadn’t done before when she had Craig near her. So far Craig wasn’t very eager to engage in phone sex with her, but maybe that was because he had to share a room with Kenny.

After Craig had moved to the campus, many guys started talking to Tweek. Especially Stan Marsh, who often offered her a drive. She had failed her driving test four times due to her anxiety, so she found that gesture very heartwarming. Bebe kept telling her that she was being naive and he was trying to get into her pants, but she assured her he was just being friendly. She had never been a popular girl, and when she was younger she was known for being a freak who smelled like coffee and couldn’t dress herself properly. Craig accepted her the way she was, and she was grateful for that.

She sighed and looked at an old photo of her and Craig on the night stand. There were things in Craig’s room that made her feel nostalgic, but also sad with so many things changing as she was growing up. Her thoughts went back to the earlier confession of Thomas. She wondered if Craig knew the real reason why his parents had a divorce. He must have, since he started becoming more distant with his father after that and he didn’t really want to talk about it. He probably knew how attached Tweek was to Thomas and didn’t want to ruin her image of him.

Would Craig also…? No, she shouldn’t think things like that. She knew how hardworking her boyfriend was, and she was constantly afraid he was burning himself out with his studies and part-time job. He also went out with his new friends a lot, but that was normal for any college student. He usually was the driver of the group, but sometimes he had a little bit too much to drink and that’s when he had a habit of calling Tweek and telling how much he missed her.

She decided to call it for a day and went to check if her old toothbrush was still in the bathroom. On her way she noticed that the door of Thomas bedroom was slightly open, and he had lights on. She was about to check whether he had fallen asleep without turning off the lights, but she froze in her place when she saw what he was doing on his bed.

His big body was very naked, and he lying in his back. He was stroking his full erected penis with fast strokes, letting out low grunts and growls as he was focused on his laptop screen. Tweek couldn’t see what he was watching, but she could hear the voice of a young woman moaning and begging to be fucked. She couldn’t stop staring, like she was glued on that spot. She rubbed her thighs together when she started feeling a familiar warmth in her pussy. The smell of his musk was filling the room, making her feel lightheaded.

His dick was big, much bigger than Craig’s. She wondered if Craig would become like him, tall with a huge cock. She knew that thoughts like that were wrong, she was supposed to be disgusted by the sight of his boyfriend’s father masturbating – yet her panties were getting damp from the sight. She was glad she hadn’t barged in and he hadn’t noticed her, that would have been extremely awkward for both of them. She shook her head and practically ran towards the bathroom, locking the door behind her.

She held her hand her chest, feeling her heart beating fast. Even after washing her face with cold water, the images of Thomas’ big cock didn’t leave her head. It had been so long since she and Craig had… She squeezed her thighs together again, the aching in her pussy was getting stronger and her clit was swelling. She should just get over with it. She sat down on the toilet seat and started rubbing herself through her shorts. She tried to think about her boyfriend, but she couldn’t forget about Thomas’ manly scent.

I don’t mean to brag, but I have always been very virile.

Her palm pressed her clit harder and her juices were leaking a bit when she thought about that. He might have been middle-aged, but he was still… Did he ever think about doing it with Tweek? Did he want to put that big cock inside her and make her beg like that girl in the video he was watching?

With that, she reached her climax, trying to suppress her moans. She couldn’t believe she had just done that. And now her panties were all sticky too, and she didn’t have any spare ones with her. She took a few breaths to calm down and decided to sleep only in her shorts. When she put her used panties in the laundry bin, she made a mental note to remember doing the laundry in the next morning.

Before she went back to sleep she checked if Craig had replied to her message. She begged in her mind that there was anything that could take her thoughts somewhere else.

He had left her on read.

Next day she felt awkward, so very awkward. Despite Thomas was acting as usual, she tried her best to avoid him. She made excuses how she should help him with chores like cleaning the bathroom, only so she could avoid direct contact with him. She had practically cleaned up the entire two-store house when Thomas told her to have a break. She didn’t want to seem suspicious, so she agreed on continuing Squid Game. The atmosphere between them was tense, and she constantly found herself breathing manually.

“Tweek, is there something bothering you?” Thomas asked out of sudden, hitting pause on the remote control.

“Huh? Why? N-no, there’s isn’t!” Tweek protested, but her acting might not have been very convincing.

“I don’t like being avoided by you in my own house,” Thomas mumbled, sounding unhappy.

“Sorry, hngh, I- I didn’t mean to…” Tweek picked her cuticles and didn’t dare to look at him. Was it that obvious?

”No, it’s my fault. I’m sorry if I made you uncomfortable yesterday. I shouldn’t have went into details about my sex life,” Thomas said and scratched his neck.

”It’s okay. I’m glad you have someone to talk with,” Tweek assured. She felt more relaxed now.

”How about you?”

”What about me?”

”Do you have anyone to talk with?”

”I… I have Craig.” She tried to sound strong, but the apologetic smile on Thomas face implied she wasn’t very successful.

”Listen, you don’t have to tell me, but if it helps…,” Thomas said, moving closer towards her on the couch. He smelled good. ”Tweek, are you lonely with Craig?”

”I –” She blinked twice, wondering if she should tell the truth. The truth she was trying hide even from herself. But when she looked at Thomas, something about his aura made her feel comfortable to open up. ”Ngh, sometimes. He doesn’t have much time to spend with me these days.” They were so young when they started dating, she had spent all her time with Craig. Before she noticed it, she really didn’t have any close friends and now Craig was living his fulfilling college life as well.

”I apologize for him. He’s dense and doesn’t appreciate a girl like you enough,” Thomas said, and there was something incredibly attractive about him right now. A mature man who was trying to comfort her. ”He should be more careful, I’ll bet guys can’t take their eyes off of you.”

”Th-that’s not true,” she said, remembering how Bebe had told her the same thing.

”Trust me, I know what such a fine girl can do to a young man…,” Thomas said and put his arm around Tweek’s shoulders. She tensed up for a second but didn’t resist, it felt good to be held by a big man like him. She was very touch starved and liked cuddling. She felt her heart beating faster when Thomas placed his other hand on her knee.

”How… How about an older man?” she asked and gasped when Thomas leaned closer toward her ear.

”Hmm… If his junk is still working, he’d definitely be distracted,” he murmured, sliding his hand on her bare thigh. Her nipples were getting harder under her shirt and her pussy started getting warm and tingly. She wanted to bury herself deep in the couch and take him between her legs.

”Does yours still work?” she asked, licking her lips. Of course she knew it did. She had just seen it last night, in all of its glory.

”I told you, I’m still very virile. But you know that, since you were peeping me last night, right?” Thomas asked, and Tweek’s cheeks flushed.

”I didn’t meant to–” she tried to explain, but Thomas hushed her.

”I hope you enjoyed the show… After all it’s you who made me that way,” he confessed and leered at her body while caressing her thigh. It made her incredibly turned on, and she opened her legs like she was inviting him to keep going. ”You’ve became a very beautiful woman, Tweek.”

His hand slid next to her crotch, and his pinkie just slightly brushed against her clothed folds. She let out a weak moan when she felt her entire pussy pulsating in anticipation. She desperately wanted to rub herself against his hand like a dog in heat.

A big finger slipped inside the shorts and caressed her folds. She was suddenly self-aware of the fact she hadn’t shaved her pubic hair, it’s not like she was planning for this to happen. Thomas didn’t seem to care about it, and his finger barely touched her when it circled around her labia. It was making her shake from arousal, and she was producing more slick juices. Thomas was clearly experienced in this, he hadn’t even properly touched her and she was already leaking from excitement. Craig was always very clumsy when he played with her pussy, but it was cute when he was trying his best. She couldn’t stop her quiet mewls of pleasure when another finger touched her pussy lips and two fingers started stroking her drenched slit.

”Already so wet,” Thomas said when his fingers gathered her slick. For Tweek’s disappointment, he pulled them out and put them in his mouth, savoring the taste. ”You taste good.”

”Th-Thomas,” Tweek whined and bit her lower lip when she couldn’t get what she was craving for.

”Shh, sweetheart. There’s no need to rush,” he said and lifted up her shirt, revealing her bra-less breasts. He gently grabbed, fondled and squeezed them, and the sounds he was letting out while doing so made Tweek feel sexy and wanted. ”These are amazing. How big they are?”

”I’m, ah, D-cup,” she said.

”Jesus,” he breathed and played with her hardened nipples. When he noticed Tweek’s hitched and desperate breathing, he asked, ”What’s wrong, baby?”

”Please, keep touching me,” she begged and opened her legs wider. He chuckled and kept fondling her breasts.

”But I am touching you,” he said, and she grunted. ”Or do you mean your pussy?”


”Then you have say what you want. Say you want me to touch your pussy like a big girl.”

”Please, keep touching my–” She took a little pause before continuing, ”My, hn, p-pussy.”

”Good girl. Come here,” he said and laid down on the couch, lifting her between his legs.

He was able to move her body so easily, and being manhandled like that made her want to submit completely to this big, strong man. Unlike Craig, who was very slim, Thomas had a big gut that pressed against her backside like a cushion. He stripped her from her boyfriend’s shorts and threw them on the floor, revealing her bare pussy. He still didn’t touch her crotch yet, and continued caressing her breasts.

”I like that you’re not wearing panties,” he murmured, and her breathing was getting more rapid when his hands were moving slower, lightly tickling her tummy.

”I didn’t have any spare one,” she tried to explain. She made an attempt to move his hands between her legs faster, but his other hand grabbed her hand and kept it restrained.

”I found your used ones from the laundry,” Thomas said, making Tweek embarrassed that she had forgot about that. He finally begun touching her aching pussy. ”Couldn’t stop thinking about the scent of your drenched cunt.”

”Oh god, yes,” she moaned when a finger entered her wetness. The palm of his hand was putting pressure on her swollen clit when he was fucking her with his fingers. She had been edged to the point it wouldn’t take long she’d cum from this stimulation.

”That’s it, just let it go. Gonna make you feel so good,” he said, fingering her faster. Her pussy was making wet sounds. ”Fuck, you’re so hot and wet inside.”

”I’m gonna come,” she said when her orgasm was building up. Thomas’ thumb started flicking her clit as his finger kept fucking her hole.

”Come for me, Tweek,” he commanded with a low growl that made Tweek lose her mind, and her entire body started shaking when her pussy throbbed rapidly around his fingers. He pushed them deep inside her and watched when she arched her back in her orgasm.

”F-fuck, hn–!” she screamed in ecstasy, losing control completely. She had never come this hard, she didn’t even know an orgasm could be this strong. She whined in discomfort when Thomas pulled his fingers out of her, a streak of slick following them, and she stopped him from stimulating her sensitive clit more. He brought his fingers in his mouth and licked them clean, making a satisfied sound while doing so.

”Want to touch mine?” he asked, and she just nodded shyly. Her face was glowing and she was still in daze from her mind numbing orgasm. He placed her hand on his bulge and let her feel him through his pants. It was bigger than she thought, and almost like he had read her mind, he asked, ”It’s bigger than Craig’s, isn’t it?”

”Yes,” she said, not sure how to feel about the mention of her boyfriend. Her boyfriend whose father she had just let give her the best orgasm in her life.

”Have you been with anyone else than Craig?” he asked, which made Tweek a bit uncomfortable.

”Of course not!” she replied in frustration. Was he joking? He knew that she’d been with Craig since they were kids! She wasn’t someone like… Someone like him!

”That’s a good girl,” he chuckled and placed his mouth next to her ear. ”Do you want my cock in your cunt?”

”I…” Of course she wanted it, right now she wanted nothing more than feel his big cock slide inside her still sensitive pussy. But this was Craig’s father, and they had just betrayed Craig in the worst way possible. She pushed him away and stood up, crying out, ”I-I’m sorry, I can’t!”


”Please, Thomas, we just can’t,” she repeated herself and quickly put her shorts back on. Thomas saw the panic in her eyes, pondered over something for a while and then smiled in defeat.

”Alright, I understand,” he said, and combed his fingers through his hair. His testicles probably looked like giant blueberries by now, but he tried his best to show Tweek he was not bothered by this. He also stood up and tidied up Tweek’s messy appearance. ”Don’t feel bad about what happened, okay? You were just feeling lonely and I comforted you. He will never know.”

“Promise you won’t tell anyone,” Tweek begged and bit her nails nervously.

“I promise. But if you’re interested in more… Hell, I’m not going to lie, I want to make love to you,” Thomas said, making Tweek’s entire face flush. “That’s only if you let me, of course. We can also just pretend that this never happened and continue living as Craig’s father and girlfriend.”

That was a lie. There was no way he could see her that way at this point. And he knew Tweek couldn’t see him as a mere father-in-law either. He had only given her a little sample of what she could have with him. That fertile young pussy hadn’t been fucked well for ages and it was craving for a good dicking.

The life of a bachelor was getting a little bit more interesting from now on.

To be continued...