"That was..... Amazing," she gasped. "Now let me return the favor." She stood up and forced me onto my back on the bed. I was still half-dressed, so s...e unbuttoned my shorts and pulled them off and quickly tore my boxer briefs away. My penis was at full attention was standing straight up in anticipation. I blushed in embarrassment as no one but I had ever seen me like that. Lindsay stood in front of me completely nude and gazed down at my throbbing member."It's so..." she said, "Huge!" Her eyes. I was in another world altogether. I inserted my hand inside her top and kept on her belly. She took it inside and made me touch her nipples. It was like dream coming true for me. Her nipples were already hard and I badly needed them. I made her lift her top a bit so that I can kiss and suck her nipples. She made moaning sounds so we got up and went into the hall where I made her sit on top of me and remove her bra too.Now she was sitting on me pressing her pussy on my hardened dick and kissing. I kissed her neck to which she was heavily breathing. We sat opposite to each other on our laps, she started to kiss my neck,bite them started sucking all over me.On the same time I am pressing her boobs to which is she being more wet and saying plz fuck me hard. We changed our position to 69 ooooo holy shit my god I was in heaven she is a good sucker, I told her I was about to come, all in sudden when I said she stopped doing it. She said.She: hold it babe, don’t be in so much hurry, I am here. The hall was full of students walking all in the same direction. Then at the far end most of them went to the right while a few of us went to the left. Their door was clearly labeled “Boyfriend Girlfriend Sex Room” while my door was labeled “Brother Sister Sex Room.”I felt someone grab my arm, it was Brenda and she was smiling. The other three couples were behind her but we let one of them go in first. There was a teacher or guard inside that checked our bracelets to see that we were matched.