I just opened the door. As simple as that. There he was, standing in my bedroom with my panties in his hand and holding them to his face. My kid brother, 15, and obviously with no sense of self preservation. I could clearly see the bulge in his pants, and I have no doubt whatsoever, that if I had been a few minutes late, I would have caught him jacking. Suddenly, it all fell into place. My panties had been going missing from my laundry hamper and when they returned, sometimes days later, they would be covered in stickiness that was far more than I could put there myself. I knew someone was using them, but as my family home is like Grand Central station, it could have been anyone of my sister's boyfriends or uncles, (I guess). I just never thought it would be Chris.
I stood there in total shock mode for about three seconds. Then I flew at him and was slapping him around his face, his neck, just about anywhere I could get at him. He fell to the ground and I fell on top of him. By now, though, I was punching, and punching hard. I felt him start to cry under me and then, almost without me knowing, I had both my hands on his shoulders and was rubbing myself against his hard on. My skirt had ridden up round my waist and I could clearly feel his cock between my pussy lips through my panties. I gripped his arms and rode his cock backwards and forwards until I orgasmed hard. I don't know at what moment my anger changed to lust, it just happened. Then I unzipped him and let his (actually very impressive) cock lay against my, by now, very moist panties. I carried on riding him until he groaned and spurted. It went everywhere, but especially over the crotch of my panties. I just got off him and walked to my bedroom, slamming and locking the door behind me. I felt between my legs and felt his warm sperm on me. I pushed the same hand into my panties and made myself cum again standing up.
Now? well, I don't know how I feel about him. Violated? Possibly. Invaded? Certainly? Ah, but also so aroused. Partly because my pussy had that enormous power, and partly, I guess because it was incestuous. Would I do it again? I really don't know. We will have to see. At the moment, its real difficult to talk to him.