Unfortunately as she walked her foot caught on a rip in the rug tripping her. Her head caught the desks edge and knocked her out. The students gathere...d around her and a young nerd assessed the damage. He told everyone she appeared to be fine just unconscious. Smiling he told them the first thing to do was loosen any restrictive clothing and removed her blouse discovering she was not wearing a bra. Another student said that skirt looks pretty tight so it to was removed leaving her naked. The. I moved my lips to hers and pressed my tongue into her mouth and tickled hers with mine and she hungrily probed my mouth. After caressing her tongue I moved my lips down her body to her nips and chewed on them with moans and groans - oooooh and uunnhhh from Annie's pretty mouth and I slid my tongue to my sisters warm cunt and traced her lips with it and she squealed with delight "OOOHHHH that feels so goood - please stick your tongue in me!!" So I did as requested and slipped my tongue in. She was doing everything I wanted, so there was no reason to push her anymore. I went to bed, realizing again that I needed to add water. When she joined me, I asked if she remembered everything she was supposed to do tonight.What she said matched what I remembered, so we did it. She climbed on top and fucked me until I came, smashing my ass into the plywood on the bottom of the bed the whole time, stopping a couple of times for her own orgasms, while I lay back and played with her magnificent. When I took them off and went for a piss as I passed her door I heard sis moaning like she does when I eat her out or when she wanks although she hasn't wanked recently as she has had me to do it. Thinking that the other girl had gone and seeing as our parents weren't at home I just walked in her room.Fuck! On the bed with her ass in the air and almost in my face was my sister. Her ass and the rest of her was naked her sweet ass and pussy inviting me to fuck them. Her head was at the other.