” I told her as I moved my hips slowly.She grinned sweetly for a moment before she furrowed a brow, concentrating on the sharp sensations betwee... her buttocks.“Where’s my cock right now sis?”“Oh. God.” she grunted to the insinuation (calling her my sister)“You’re such a dirty little fucking slut.” I grinned down at her. “You know that?”“Oh. Yeah.” she agreed with a moan.“Look at you. Lying here with a thick cock. ...oh....ok...." was all i heard him say as she did that. I could look up and see her work her magic with her mouth. I could see his dick resting on her face in a semi-erect state as she ran her tongue along the underside of his balls and it kept getting harder. Finally when it got good and hard and sticking straight out into the air she started bobbing her head back and forth on it."Oohhhh God that's good!" he moaned out "Oh i love it when you do that!"As he said that, all i could think of is. ' 'Whatif he doesn't ask?' 'Hemight not, he might find it too humiliating but I suspect he will, he hatesgoing a month with only one jerk off, I doubt he could last two months. Mybet is, he will ask you as soon as I leave, hoping you'll let him come afew times while I'm away. If you want to, that's ok, I'm feeling magnanimous.' Rosestood up and kissed me goodbye. 'I'll send you a postcard. Have fun, I knowI will.' Later,I stood at my kitchen window and watched Johnny drive into Rose's. I realized that the periods of her silent straining were coming quicker and closer together and that was the sign of her looming orgasm. The way she was losing control of herself, her fleeting, asymmetrical facial expressions and the rampant shuddering that wracked her indicated that it was to be monstrous. I can't say why I just stepped right in front of her so that my cock pointed directly at her, resting my thighs against the edge of the bed, close enough for my cockhead to nearly touch.