" "Wait, are you thinking..." "Come here," she whispered. I leaned over, and she put her arm around me, and her hand on my chest, which she started ...aressing. "I know this is wrong and bad, you being my brother, but I don't care." She then leaned in, and pressed her lips against mine. My sister and I started to make out, her hand caressing the back of my head, my hand rubbing her shoulder, and both our tongues inserted in the others mouth. My hand moved down, and started groping Heather's. She said that he is undergoing treatment since 2 months but there is no improvement. Even if he gets little bit of erection, it is only for 4-5 seconds.During these days my parents went to native place for one week keeping my sister at home to take care of my meals. Same night when I was sleeping in my room my sister knocked my door. When I opened the door I saw my sister standing. She had worn a nighty, and was looking very sexy, as she has a very attractive figure. She entered my room and. I cranked up the amplitude to the max--20 and hit him for five minutes. He crumpled and lay there twitching. After calling 911 for the cops I hit him again, same power and duration. I figure that I burned out his prostate at that level. Too fucking bad.The little old lady had caught the fringe of the effect. I helped her to a seat and held onto her for a bit until she came to."What the hell..." Just relax. You got caught in the edge of something I projected at the bastard that tried to hold you. I felt good - she is older than me and more experienced but she liked what we were doing.Then she said ok now we are going to fuck and I had a pretty good idea of what I had to do. The only problem I had was I pulled my cock out a few times but it went straight back in and she giggled a bit when we were doing it. As I was fucking her we talked about it and she then started to tell me about how wrong it was and I must never tell anybody about what we were doing. She said I must never ever do.