You on the bed trying desperately to get him into you. Then of course the two of you fucking. For some strange reason even the passionate kisses were ...lmost intoxicating to me. You and him embraced in each others arms and kissing so deeply with your tongues. It really did something to me." "You know, that might have been satisfying the desire to see me making love with him rather than just, you know, fucking." "It might be, your right." I said Then she asked, "Was there a time for you that was,. “What are you doing?” I ask her unsure. She didn’t reply straight away, instead her hands moved down to my thighs stopping about half way up my legs.“Nothing” she said her voice even and smooth. Her skin felt hot and smooth ageist me. This was a side to Scarlett I had never seen before. I felt a horny electric sense flow though me. Wait this is my best friend! A girl! This is wrong! I told myself. I looked down and Scarlett laughed pulling away from me. “Omg your face!!” she laughed jumping. “Are you alright?” she asked, looking up from the straps to my face, inches from hers.“Fine, all good.” I said, as a bulge started to develop in the front of my trousers.She reached down towards my groin and I truly thought she was going to touch me. Well actually, if I’m honest, I truly hoped she was going to touch me.She pulled on the straps and almost cut me in half as the webbing pulled into my genitals.“There,” she said, “That should stop you moving about.”With that she swung her leg over. I took the time to examine the scene now that the action had died down. The professor (that's how I thought of him) looked about thirty-five, in good shape physically and with just the slightest stomach fat showing. He had all his hair, and showed a bit of gray around his temples - the type that makes a man look distinguished, not old. I would have judged him to be relatively handsome, not that I'm any kind of expert on the subject. Still, I could see why my sister would be attracted to.