Kelly's mistake

Kelly wasn't an idiot. She noticed that something weird was happening in her home. Her step-brother Ralph was ...different. She might have believed that the issue was that Kelly was now seeing him in new light, knowing (from an innocent accident) that he was packing a monster dong. It was certainly hard (no pun intended) to not notice the damn thing making a bulge in his pants. And he was just walking around with that thing! In her home! ...But how come he wasn't bringing girlfriends over every night? Or staying out getting his dick sucked. (Now that would be a two woman job at least.) Kelly almost wondered if his dick didn't work, because otherwise it would be such a crime to the female half of the population that the nerd wasn't even using it to scramble the insides of some lucky woman every single day of his life.

...Except, Kelly had started to wonder, maybe that was what he was doing. There was a subtle shift in her mother as well. Suddenly she seemed far more satisfied than before. Kelly wasn't sure if she was more upset at the idea of the dickweed banging her mother, or that he hadn't come (or more accurately, cum) to her instead. Jealousy and anger were fighting for supremacy inside her head. And it had nothing to do with how her mom suddenly had a growth spurt for her tits and tits alone. What the fuck was that about anyway? Kelly thought to herself. Kelly had been quite happy with her own breasts but now either her mom secretly got implants or something really weird was going on. Still, Ralph was probably a porn addict and step-**** was the hot new thing in porn, so if he had been banging her mom, he was not going to turn down his hot young sister either. Right?

She intended to get to the bottom of this mystery tonight. Her mom and step-dad were away for the night, so she could easily pin-down Ralph for an interrogation. In fact, wearing skintight yoga pants and a top, she aimed to make him spill the beans one way or another. If he didn't get a hard-on the moment she did some stretches in the living room, she'd know his dick didn't work. And if he did get a hard-on...

...Well, teasing her brother was just a duty of hers and that should at least give her a chance to question him on the lack of girlfriends. Yeah, making fun of the cute (did she really think of him as 'cute?' What was wrong with her?) guy with a big ...juicy looking... ...massive... dick was sure to be harmless fun that would never backfire on her. Not like that nerd would have the guts to do anything about it.

*Not very much later*

"HEEEEELP!" Kelly was pinned face down on Ralph's lap. She had no idea how he had gotten so strong, but he was able to hold her hands behind her back with just one of his hands. Leaving the other free to spank her. "AH!" Each slap made her shudder. Kelly's butt was getting sore from the spanking, but worse still, the slaps would every now and then hit her cunt lips, leaving them sensitive and tingly as well.

"This'll teach you to keep your stupid mouth shut!" her step-bro warned her. "Stop fucking teasing me all the time. Got that?!" His voice was... primal? Animalistic? ...Commanding.

"Yes sir!" Kelly answered automatically. What the fuck? Why did she call this fucking nerd 'sir' like that? Ralph finally stopped spanking her. As if to reward her for submitting to him, he began to knead and grope her ass cheeks. Kelly was still sensitive as hell, but being caressed... Being taken... It felt good. It felt right. She didn't have more time to question this as Ralph suddenly pulled her head back by grabbing her hair. That hurt a bit too, but she again noticed that getting manhandled by a commanding stud (what? no! Her nerdy step-bro is not a 'stud') felt ...nice.

Ralph **** Kelly to look him in the eye. "You hog the bathroom, you make fun of me, of my dad... Now you finally show some attention to me, but only because you got a glimpse of my dick... Well, you are going to get that dick and you'll get it hard and deep, but not before I teach you another lesson." Kelly should have been horrified of that threat, but again she felt deep inside her rejoice at the thought of submitting to Ralph ravishing her. Even as she was getting wet at the thought, she wouldn't admit it out loud and wanted to push back. Just a little. Her bratty side would never admit that she was the one who wanted Ralph more than he wanted her.

"Fff... Fuck off. You think you can just bend me over and **** me? All I did was point out what a lil daddy's boy you are. Can't handle a little teasing?" There. She said it. Now she could take whatever he dished out and still say that she fought to the end without submitting. No regrets.

LOTS OF REGRETS!

Ralph pulled Kelly onto his lap. This did not help her with how sensitive her butt was. Any protests died when Ralph suddenly took hold of her skintight yoga pants and shredded the groin, revealing Kelly's sopping wet cunt to him. She gasped in shock. Even as she tried to close her legs and cover herself, Ralph spread them again and this time assaulted her pussy with his fingers. Kelly should have been fighting back, should have been trying to escape. Instead she simply writhed on his lap as he played with her masterfully. She was just the right amount of sensitive and frightened for this **** to drive her crazy with lust.

"You think a big dick is all I have? I'm gonna make you cum with just my fingers, and when you do, you'll beg for me to fuck you for real." Ralph teased her.

"Mmmph! FFFuck off! I'll -Ah!- I'll neveEEER! Ooohhhffffuck!" Kelly's attempts to protest failed again and again. Soon she simply covered her mouth with her hands, trying not to moan like a bitch in heat and give him the satisfaction of seeing just how much he was affecting her. This did not help, since she lost control of her hips and ground them against his hands.

To her horror, Kelly heard the door open as someone came in. Having Ralph make her melt like this with just his hands was embarrassing. Having someone see it would be so much worse.