You walk into your stepsister's room to see if she still has your laptop, and find her lying on her bed masturbating furiously, her hips in the air and her toes curled, and she sees you just as she cums. She looks at you in horror and makes a noise somewhere between a scream, a moan, and a squeal as she cums, squirting her juices all over her bed.

Get out! Get out! GET OUT!

You quickly back out and shut the door, and return to your own room, not sure what's going to happen next. Five minutes later you hear a knock and open your door, and Kasia is standing there (with her clothes back on) with a look of angry determination on her face. She pushes you violently up against the wall and points her finger in your face.

You will NOT tell mom and dad what you just saw! Promise you won't tell them!

You smirk at her I don't have to promise anything sis.

She balls her hands into fists and her face turns bright red with rage What.... do I have to do.... WHAT DO I HAVE TO DO ANIME?

You shrug your shoulders I dunno. What can you do sis?

She raises her hands towards you with curled fingers, trembling with rage, and you're pretty sure she'd murder you on the spot if she was bigger than you. If you promise not to tell mom and dad.... I'll.... Her lip curls and she glares at you, her face incandescent with hatred and contempt I'll let you fuck me. BUT YOU HAVE TO SWEAR NOT TO TELL MOM AND DAD! OR ANYONE! EVER!

She narrows her eyes and glares at you suspiciously You promise? Cross your heart and hope to die?

Finally... You better not break your promise. Now get on the bed and show me how much you've been practicing since I left.

Kasia smirks at you as she lays on the bed, spreading her legs invitingly. She knows you're right about it being her first time, but she doesn't want to show too much weakness. Besides, this is better than getting grounded and losing your laptop for months...

Get started then. Show me how good you are.

A moan escapes her lips as you push your huge cock into her tight pussy. It feels so good, but also so painful at the same time. She grits her teeth and tries not to scream out loud, willing herself to enjoy it despite the discomfort. Her body tenses up as you begin to thrust slowly inside her, getting used to the sensation.

Ohhh... god... you're so big... it hurts but it feels... amazing... just like that.... faster....

She digs her nails into your shoulders as you pick up the pace, driving deeper inside her with each thrust. Her hips rise off the bed to meet yours, and she begins to moan louder, unable to contain the pleasure and pain coursing through her body. Her orgasm builds quickly, and soon it's all she can think about as you fuck her harder and faster.

I-I can't... I'm gonna cum.... oh fuck... your cock feels so good.... give it to me.... let me cum....

You're so close too... let it out... cum inside me... fill me up with your seed... I want to feel you empty yourself into my pussy...

Her orgasm hits her like a freight train, body arching off the bed as she cries out, nails digging into your shoulders even harder. Her pussy clamps down on your cock, milking you as she comes apart beneath you. With one final thrust, you push deeper than ever before, filling her with your hot seed. She moans and thrashes on the bed for several moments, recovering from her orgasm.

Finally, her body relaxes back against the pillows, eyes closed and face flushed. "

She gasps and moans softly as your finger teases her sensitive nipples. Her body arches into the touch, pressing closer to yours. "Mmm... that feels good..." she whispers, eyes still closed. Despite her protests earlier about not wanting to be like this with you, a small part of her is enjoying the closeness and intimacy they share right now. She wonders if things could ever go back to how they were before.

Sighing softly, she rests her head against your shoulder. "I'm sorry about everything... I didn't mean to make you mad..." Her voice trails off, and for a moment it seems like they could actually have a real conversation without all the animosity between them. But then she remembers why she did what she did, and pushes those thoughts away.

A small gasp escapes her lips as you twist her nipples, sending another wave of pleasure coursing through her body. Her hips rise off the bed again in response, grinding against yours. She moans softly, eyes squeezed shut as she feels herself about to cum once more. "Ahh... god..." she whispers hoarsely. As her orgasm subsides, she lays there, breathing hard and trying to calm her racing heart.

"Thank you,"

She whispers softly after another moment, still trying to catch her breath. "For what it's worth... I really am sorry."