"Heather launched into an orgasmic frenzy after her brother promised to ass to mouth her. Her ass clenched up rhythmically as her body shook with plea...ure. Jacob felt himself wanting to cum as his sister's ass glided up and down his rock-hard shaft. He withheld as Heather's frenzy came to an end. Jacob pushed his cock as deep as it would go into his sister's ass. "You want this cock in your mouth now huh? Come on s*s, you are such a fucking slut."With that Heather turned around and sat down on. Turned out she had a little something to show me, well not so little a something.I didn’t sit there like an idiot gibbering, I just stared at it while she stroked it and it slowly got hard. Some part of me did say "Run!" at least I tell myself now that it did. But I wasn't listening to that mental voice. I think my penis was also shouting to drown that voice out.I know she was talking, but for the life of me, I can’t remember exactly what she said. When I didn’t go running from the room, she. "Even Grandma and Grandpa?" Yup them too."I helped them into the gowns as they pulled off their shirts, I told them they could leave on their shorts until the doctor came in. Which happened right as we were done with the gowns. I turned to greet her and all I could think was "Wow". OK, let me clarify. She wasn't like a stop traffic kinda gal, but she definitely wasn't hurting in the looks department. I think I just wasn't expecting her to look like she did. If I had to guess, I'd say she was. I was an adopted son for a husband who had three daughters. I never found out his reasons for adopting me, as he passed away in a car crash when I was four (a year after I was adopted) and I was relegated to "Cinderella" status in the household. I cooked. I cleaned. The only thing I didn't do was the laundry, except for my own and I was expected to do one load of clothes for myself a week (thank God I don't own many clothes, unlike my sisters).It would have like any other day of the week except.