Once everything was ready again, there was a big group of technicians watching each machine very closely. The two went back to poking me with pins, ag...in. One of their pokes missed my leg and jammed into my balls. That made the second EKG machine to make a sparking sound before it started smoking. Saying he was verifying something, I got poked hard in the side of my dick. There was a zapping noise in the lights overhead before the room filled with a very nasty, acrid smelling smoke. Some rushed. He stares at Chris' cock and then at mine."I'd suck Chris's cock, but from the looks of things it was just in your ass," pointing at the semen running down the back of my leg. "I don't know where I want to start." He steps in front of me, squats and takes my dick into his mouth. Chris walks to the bathroom and wipes his dick with a washcloth and returns. Canon alternates between our dicks until they are fully erect, leads us to the bed and says to me, "You take my ass first, Chris is too. ” She picked a dare before I asked but that was okay. I thought, what could I dare my younger sister into doing, what might she do, what wouldn’t she do? As I was wondering I looked again at the blouse stretched tight over her breasts “Flash me, I dare you.” She gulped, I saw her throat work then she bloomed red in the face. “Really? You want me to show you my tits?” I only nodded. She sat for several seconds trying to read my mind and came to the conclusion she had to do the dare, she’d asked. "Why'd you stop?" I asked breathlessly. "Beg me to cum." "What--" I started but was cut off by him turning it on again & fucking me with it to that point and turning it off again. "Beg me to cum you slut." He said , kissing me."Please let me cum." I whispered as he broke the kiss. "I can't hear you." He said switching it back on again, slowly easing it in and out of my dripping wet pussy."PLEASE LET ME CUM! " I shouted, just as he began fucking my pussy harder, and my body started quivering.