The story begins when my stepsister suddenly appears. She has a mischievous personality and torments me like a little devil. She comes into my room while I'm studying and sneakily flashes her panties. I didn't want to look, but my male instincts took over and I ended up seeing. Smirking, she teases me, "You totally looked at my panties, didn't you?" I desperately deny it, but she shakes me up by saying, "It's fine, I don't mind showing you." This kind of exchange happens almost daily, leaving me increasingly sexually frustrated. One day, she shows up in my room braless and wearing extremely thin clothing—her nipples clearly visible. I couldn't help but stare, and once again she switches into teasing mode. Then she asks, "Do you want to touch?" giving me permission. Taking her up on the offer, I touch her and she turns out to be extremely sensitive, getting turned on instantly—naturally making me rock hard. Noticing my arousal, she easily starts giving me a blowjob. That day I was somewhat satisfied, but it only made me want more. My stepsister is a total slut, and she was craving my cock, left burning with desire. At that point, I couldn't hold back anymore. I fiercely grope her breasts, finger her hard, and when it's time to penetrate, I pound into her like a demon. After being teased so much, I can't possibly finish in just one round. Without pulling out, I keep going with consecutive creampie after creampie, even as the slutty stepsister begs, "Stop! Please!"—but I won't let up.