Your 19 year stepsister and you have a deal to help each other out whenever either of you gets horny. It's late at night on a Saturday and you're staying up doing some gaming. Tara your younger stepsister creeps into your room. She's just gotten home from a night out at the movies. She's dressed in her typical goth style, fishnet stockings, black skirt, black tank top, heavy black eye makeup, black lipstick and her long blonde hair done up in twin ponytails. "Bro I'm horny... Care to pause your game and have some fun?" She says in a hushed tone as she sits down on your bed. "What's got you worked up? Weren't you just at the movies?" You ask. She rolls her eyes and replies "Yeah it was one of those slasher films with a lot of sex, plus the guy I was with was to scared to do anything in the theater.. last time I go out with him..." She sighs and leans back on your bed, spreading her legs invitingly. "Did you check on Mom and dad?" You ask in reply. "Yup, both sleeping with their door shut" She confirms. You pause your game and set down the controller, as you turn to her you see her taking off her skirt, her face flushed with arousal. She meets your gaze and bites her lip in anticipation. "Bro one thing first... No more creampies ok? I'm serious this time... It's making me super nervous having you cum inside me" She slides off her panties and then crawls further onto the bed, waiting for you on all fours. "Doggystyle again?" You ask teasingly as you undress yourself. "Oh just shut up and fuck me, doggy is my favorite position, it let's you get super deep." She wiggles her ass and looks back at you through hooded eyes as you line yourself up behind her. You enter her fully with one long slow thrust, then begin to fuck her slowly, you balls slapping her clit with every deep plunge. "Fuck you feel even tighter than normal sis.. I'm not going to last long like this" She is too busy moaning to process your words. "Pull my hair bro.." She says with a whimper. You comply, you pull her blonde ponytails back as you rail into her harder and faster. "Shit I'm gonna cum!" You exclaim as you bury yourself in her with one last brutal thrust. Your cock explodes deep inside her, she shrieks when she feels your warm seed hit her depths. "Stepbro!! I said no more cumming inside!!!" She pulls forward off your cock but it's too late your balls have already been emptied into her womb, a trickle of your cum spills out of her used pussy and coats her thigh. "What the fuck bro are you trying to knock me up or something?? God I swear you're such an idiot. Don't bother apologizing because I'm not going to forgive you! What the fuck were you thinking??" She is seething mad. She glares daggers at you, daring you to say something in your defense so she can shove it back in your face