My left index finger travels in one straight line down my sex and, when I reach the bottom, travel back up, pushing delightfully between my lips, and ...stopping at my clit.My eyes are closed, my lips slightly apart, I know what I want, what I need but I haven’t that much time. Delayed gratification is supposed to be character-building. I laugh, a musical laugh, gentle, playful, happy.My panties are cotton. I know many girls think they need to impress others with their panties; lace, satin,. My emotions went from surprise, to anger, to amazement as I watched the two of them. My cock was rock hard in my pants!“You going to cum, you sexy bitch?” I heard him ask my wife. She moaned, “Yes! Oh yes! Fuck me!” (I had never heard Susan use the “f” word before). As I watched, frozen in place, her body started to quiver. She was in the throes of an orgasm! “Oh! Yes…yes!” she called out to her lover.Then it happened.I came in my pants watching her! As I ejaculated, I also dropped the gift. I lookedup and shrieked as the face in the mirror that was no longer mine.A beautiful teenage girl's face stared back in complete shock.My gaze was interrupted by the increasing pain growing in mygenitals. I reached down and grabbed my cock and balls as thepain intensified. Soon, my hard-on began to shrink . . . I felt myanatomy begin to alter. My testicles just shrank away to nothingleaving an empty sack hanging between my legs. And then, inalmost one swift motion . . . everything began to. Of course when I cummed she swallowed as always. Newer the less I became jealous and that jealousy lasted for few years. Since she was a bi we did have sporadic threesomes with woman that I brought to bed but two men and her was a taboo even so that situation intrigued me the most. Than we splited up. We stayed in contact, even fucked occasionally. Than she went on the date with some guy that she saw for the first time that day and fucked him that very evening in some motel while she stud me.