?Then she turned me around, pushing my scorched butt against the sofa, and she began to pull on my cock, which had lengthened.??"You want this, right,...Miles?" Gretchen had breathed in my ear. "God forbid I do the wrong thing by you."?I was biting my lip, trying not to sob further. "N-no Miss Gretchen..it's what I need!" Gretchen had laughed. ?"Miss Gretchen, huh?" She'd stuck a wet tongue in my ear and began toying with my cock all the more.??My hands were tied, of course, to keep from jumping. “I know what it is Professor! You’ve never been fucked in the ass, have you? You took my dildo like a champ. You liked it, didn’t you?”This girl is really getting to me, and I don’t know why. I am grunting and roaring and trying to fuck her harder still, to no avail. We both shift our grips to clasp our hands behind each other’s necks, making it easier to hold on. That brings Amy’s calm, expressionless face within inches of my sweating, grunting, puffing face. Amy’s hips absorb each. I emptied myself into her as she fell down on my chest, passing out with my deflating cock still inside her.*********************************************************************************************The rest of week went very similar; the girls were spending more and more time together. Then Jen would always come to me still horny, and fuck me like crazy. Each day she more excited than the day before. They sometimes met in Jen’s room, so I didn’t get to see all the encounters. The next wasn’t. Gingerly, I slipped my fingers into the crease and stroked up and down its whole length."Can you feel your brother's fingers on your ass, sister? Can you feel me touching you?" Yes!" she gasped, humping her sensitive clit against my hipbone with frenzy."You belong to me, don't you, s*s?" Yes!" I can do anything I want to you, can't I?" Oh, yes!"I traced my thick finger down to the lower part of her butt crease and felt her little rosebud pass beneath my fingertip. Her body lurched as I touched.