But as soon as I opened my mouth, a big hand closed it shut. I could now feel hands all over my ass which I think were Mark’s. Holding my waist tigh..., he started to slowly push his dick inside.It was really painful and I could feel my ass hole tearing. I was struggling hard to get away but the grip was too hard for me.Mark started to go back and forth now. Because of the lubricant, the pain subsided and I could breathe a little. Mark was going harder and deeper. I thought it was the end of it.. "For the next 48 hours we belong to you. We are here for your enjoyment, your pleasure, your fantasies made real." But Susan, you're..." Sue silenced his objections or whatever he was about to say with a passionate kiss on his lips. He was slow to respond but gradually she felt him kiss back. She pulled one of his arms around her and she smiled to herself as she felt his hand trail up and down her back.Susan moved around behind him and whispered into his ear, "Doesn't she look incredible?". . you're still faithful Margaret, never fear."I don't know how long I was holding her, but she soon cried herself out and I bent my head to kiss her lips, to find that she was soon returning my kisses herself. "But this is so wrong of me." She said after some minutes."Why? We're girls together we can't harm each other or anyone else." I said.Margaret smiled and kissed me again before she spoke, "But I promised Michael that I would never take another lover again! That I would remain faithful to. That was my plan anyway.I reached into my pocket and extracted my handkerchief and put on the seat where it was handy. Once again I surreptitiously opened my fly and freed my hard cock. This time it came to rest against mom's panties. Mom was one of those women who wore her panties over her pantyhose, more for aesthetics than for any practical reason. She must have been wearing satin or silk panties because they felt absolutely fantastic against my manhood; so silky and slippery.Mom was.