I said nothing and did nothing but raise my bum up some more and slid my boxers fully down exposing my balls and visibly stiff cock to her. She bit do...n again more gently this time. I could feel those amazing lips and tongue begin to explore me. Slowly but surely she moved her mouth down my leg and over to my balls, those lips covering them like a silk cushion. She wandered around there for a while before slowly moving up my body, the tip of her tongue gently feeling out for my bum hole. Slowly. He was a truly loving brother to his little sister.After a few times that happened, Grace and I suggested to Bobby that he sleep with his sister so maybe she would feel comforted and protected. Once he moved in there, the screams stopped and both of them got a good night's sleep. Many parents would abhor the idea of siblings that old sleeping together but those two were very close and had suffered through the worst abuse imaginable, so we could see no harm in them sharing a bed. Also we could. Without thinking about it too much, I slid his dick into my mouth. It was a nice piece of meat - about 7 inches uncut, with a bush growing at the base. I let his shaft slide into my mouth and stopped when my nose was burried in his pubes. I breathed in. Then I started bobbing up and down on his now hard cock, using my hands to play with his low hanging ball sack. He moaned. Coming off his cock, I slid his nuts into my mouth and sucked them one by one as my hand slowly worked his shaft. He must. My sister tells me you want two girls and that you asked for me. I think you want to put your thing into Rosita's little backside."She approached me and grabbed hold of my hard as a rock cock wrapping her tiny fingers around it even though they didn't go all the way around. She liked it so much that she soon was using both hands to stroke me with childish delight despite the fact she had to be around twenty years old. The blonde was licking my nipples with relish and I was tempted to tell her.