You just don't want to."You'll have to show your sister what you've become."And what have you become, Vonda?"She flushed. "A sex slave, who will do wh...tever her master tells her to do."Just talking about it got her aroused. Moisture was seeping out of her exposed lips. Her hips began to slowly gyrate."You could always hide in the bedroom, while Vanessa is here," I joked.She nodded. "I'll do that."I was stunned. "You're not going to see your twin sister, who you've not seen for, what, six. And I LOVED IT! As he worked me over like that, I found myself remembering how much my ex-wife had never, ever liked sucking my cock; that she found the whole thing revolting, and disgusting; but this other guy now...he didn't seem to find anything remotely disgusting about sucking my cock!In my memory, it seems to have gone on for quite some time, but in reality, it probably didn't. Still, for however long this lasted, I knew I'd crossed a line, a Rubicon; and I knew that I'd never cross back. When she arrived we decided to just order some take-out and watch a movie to get the night started. At one point in the movie it got to a explicit love scene between the two main characters and I could see out of the corner of my eye that Becky way rubbing her panties under her skirt, this sight got me semi-hard knowing that she was feeling horny. So I leaned over and kissed her on the lips while guiding my hand over hers till I felt her moist panties and began rubbing them up and down her slit. A couple of years ago, my sister in law was asking for ideas about what to get her husband for Christmas that was a bit different. She didnt have much money and they had had a tough year so she wanted something special. SO I suggested a calender of her. I said I could either take the pictures or if she wanted something a little more exciting I would give her the ideas and let her borrow my camera if needed. Anyway, she liked the idea and said she'd have a think and get back to me. Sure enough.