I will never forget the sound of her dildo, slurping away in her wet cunt, while she shouted her orders “Robert get your fingers in Peters arsehole......I want you to open it”. After twenty minutes of sucking Robert’s cock and fingering at his arsehole, which he really enjoyed, at one point I had four fingers in him. Liz pulled his cock from my mouth and kissed me full on saying “you do that so well ... Robert is just loving it” as he squirmed above me.Liz with her teeth gritted ...whispered in. His hard cock was already deep inside my pussy. He started fucking me, hard. It was if breeding lust had overtaken him. He fucked harder and wilder than I have ever felt him, and I pressed back into him just as hard. My cunt squeezed his cock as he fucked. His member felt huge and hard inside me, stretching me."Please... spurt your cum inside me. Make me your bitch. Claim my womb with your seed."My words pushed him over the edge. He pushed inside me as deep as he could go, and I felt him. But you arrested just before I jouisses. You get up with a defiant look.This look turns me on more. I push you on the bed. I too want to enjoy. I get on you. You debates while I pull your shorts. I let you get up again. You try to run away towards the door. But I get you from behind catching your breasts. You feel my hard cock against your ass. I push you against the wall. My hands get the tissue and slowly tears your shirt in you biting the base of the neck. You sigh. This is only a game but. Through any of this stuff with her brother, she tried to not acknowledge him directly. I was surprised when she spoke to him on every upstroke: “Cum in my throat Steve.” “Shove that big cock as far in as it goes and cum in me.” “Do it for me, Steve. Cum in your baby sis’.” “Fuck my throat and cum in me!” She would slam her face back onto his cock with the attack of someone who would take it very, very personally if he didn’t cum.As she was fucking him with her face I saw her slide her middle.