She was trying to open her mouth to say something.After some time, while I did not leave her, she surrendered and opened her mouth which gave me acces... to explore her mouth with my tongue. Her lips were soft and juicy like roses. I stretched her on the backrest and was almost over her. Her grip around my back was getting tightened and my hand was pressing her boobs over her dress.Both of us were moaning and totally out of control. I pulled her dress down over her breast and half her boobs were. On my little sister. As I stepped out of my panties, I stared at her fiery bush.My sister's juices dotted the tight curls. Through them, I could see parts of her pink slit and... maybe the hard nodule of her clit poking out of her folds. I shuddered as I straightened, my dick bobbing, my sister's head watching.“You're... big, Charisma,” she said, her words taut.“Yeah,” I said. In the background, the final futa, a sophomore, was called. I hardly paid attention as my eyes drank in my sister's. She was bound to be caught in some sort of situation, Ginny just never imagined the consequences would be so... Arousing.It happened one afternoon-- A Hogsmeade weekend. The three girls figured that they would have plenty of time to fool around in the prefects' tub while the other students were out enjoying their Hogsmeade trip. Hermione had volunteered to stay behind and "patrol" so, the other prefects could enjoy themselves at the snowy, adventure-filled land outside of the school. Olga was one of Kay’s roommates she was American Russian and very beautiful. She had a white/platinum bob cut with piercing hazel eyes large 37 DD breasts, a firm and taut buttocks and she stood at 5’8. ‘Good morning Kay.’ Olga said in slightly accented English. Kay gave a shy smile and she lowered her head avoiding looking at Olga. ‘M-morning Olga,’ Kay said. ‘Stefani is making breakfast, then we were planning on going to that carnival that came by yesterday…’ Olga said. ‘Oh, ok! I’ll be there.