Me and sis in class

today my sister decided to go to school with no panties and a skirt. every chance she got she would bend over to secretly flash me. it got me so hard. during class, she would rub my pants under the desk when nobody was looking, feeling my dick getting hard from her touch. my balls ached for my sister. it made her horny too, and she stated rocking back and forth, rubbing her bare wet pussy against the seat. finally, we couldn't hold it any longer. s*s got up, leaving a small damp patch behind, and asked the teacher if she could go to the bathroom. i followed her lead a minute later to avoid suspicion. I found my sister in the girls bathroom, her skirt already lifted up and rubbing herself in a stall. she yaked my pants down and immediately slid my hard dick between her swollen pussy lips, my balls all ready to pump her full of my brotherly seed. when we got back to class, i saw a dribble of run down my sister's leg