What should she do if John came down? She regretted letting him see her watching them when he was making love to her sister and she regretted flashing...her tits at him. If he thought she was an easy lay it was her own fault. Was she an easy lay? The eighteen year old girl didn't want to think so but she spent too much time thinking about sex... and about John giving it to her sister. And even though Barbara had said some not so nice things about her she was still her sister and it would be wrong. He soon found the right rhythm and was able to slide his cock all the way down to Mark's balls and then over his shaft. The sensation was everything Tom imagined it would be from all the porn he'd watched depicting this very act."So good, man," he moaned into Mark's mouth as they made out again. "I'm gonna cum on your dick. I'm going to shoot my cum all over your beautiful cock."Mark didn't answer, just leaned up to kiss the older man and grabbed his hips to increase the friction. His balls. It was her I had the crush on. When they got in I noticed they grinned at each other before talking.“Okay, lets see who was brave”, said Betty and with a quick motion, not seeing that I was there, hiked up her skirt and showed that she was not wearing any panties and her pussy was very well shaven and red, not that I knew yet what the redness was from.My babysitter, who knew I was there but thought Betty did, too, wanted to look cool and go along, so she pulled down her excersise shorts and. She worked me, continuing to kiss me, driving herself down onto my now aching cock.Finally she spoke. "You know he used me, and was fucking me less than 20 minutes ago."I nodded my head, having a hard time with the knowledge; I buried my face in her open breast, closing my eyes to fall into the world of her womanliness. Still she continued with her words."He told me you knew. And then he had me meet him at the hotel. He fucked me for a solid hour; for a while, he made love to me."I had to.