One day being extra horny after PE lesson where the girls were doing gymnastics in there tight clothes in plain sight I went straight into my room and...started to masturbate. In the hurry I forgot to lock my door and that is when it all began. As I was stroking my teen cock I noticed that there was a shadow in my room and when I turned around saw my sister standing there looking at me with her eyes wide open. She looked at me for 5 seconds waiting for me to give some kind of explanation. I just. Slowly she rises from the ground and she looks at my cock. She asks timidly “What do you want me to do now?” I reply quickly, “I think you know what I want you to do.” She puts her hand forward and grips my hard cock and pulls me close to her. She kneels down and spits on my cock and rubs her saliva all over. Then she gets up spits on her hand and turns around bending over the desk and smears her spit on her anus. Without a word I thrust hard and fast into her arsehole. I could hear her scream.. Bonnie just collapsed on the bed and spread her legs. She wanted her sister again, the way it used to be, and she gave in to her desires. Lucille proceeded to undress herself while she continued to lick her sister's now wet pussy. Once she was naked, Lucille climbed onto the bed and got in the 69 position with Bonnie and they proceeded to eat each other out until both had cum at least twice. Harvey sat in the side chair and pulled out his cock, stroking it slowly as he watched the sisters. He nuzzled her neck, landing light kisses that sent shivers cascading down her spine. They kissed again and she became aware of the growing mound in his trousers, which only caused her to become even more aroused. Releasing her hands he motioned for her to step out of her panties, which she did unquestioningly. He scooped her up in those big arms and sat her on the table. Not knowing what to expect, she put her arms behind her and leant back on her palms, parting her legs to display her.