You awake slowly, your head feeling cloudy. It takes you a moment to realize the last thing you remember was Anne - now a giant anaconda - having bitten you in the neck. You touch the area on your neck where Anne bit you and it feels scaly.
"Hello, lover" says Anne. You realize you're laying in front of a large window in your house, the bright sun shining in. Anne is curled up sunning herself next to you.
You manage to get to your feet. Everything looks strange and certain things are far clearer than others. You realize you must be sensing heat like a snake. Instinctively you flick your tongue out, finding it is longer and forked. You examine yourself looking for other changes. Snake-like scales have worked their way down your arms and down your back, as best as you can tell (you have no mirror handy but it feels that way to touch). Your hands are still human. Scales also seem to be working their way down your legs but are only down to mid-thigh so far. Your stomach is scaly, but a different kind of scales, like the belly of a snake.
But you're horrified to find your genitals seem to have completely vanished! Your belly scales proceed down your stomach to between your legs. What good are you now?
Anne slithers to you, wrapping her way around one of your legs and up your torso. The sensation of her stomach plates against yours is erotic. Anne coils around you, but doesn't squeeze tightly as she brings her face up in front of yours.
"How doesss lover like hisss changesss so far? I sssussspected you would become a full sssnake like me but it ssseemsss perhapsss you will be sssomething different. Or perhapsss the change is merely ssslow..."
"The change has taken my manhood, Anne!"
"Are you ssssure?" She leaned in closer, rubbing her head against me and flicked her tongue against my ear. Her serpentine lips met my still mostly-human face and our tongues entwined in away never possible as humans. Anne continued rubbing her belly against my belly and leg. I could feel a warm in my groin area. Maybe something was there after all?
Our mouths parted and Anne uncoiled from around me and lowered her head to my groin. She rubbed her face against my scales then flicked her tongue against the area. I felt something stir within me. A few more flicks of Anne's tongue and I felt two of the scaly plates in my groin area slip apart as my member emerged from hiding.
"Yesss!" we both exclaimed.
Anne slid her body along the ground with her stomach upward, bringing her cloaca into place beneath me. I was full aroused and eager, but my member was not stiff like it would normally be. It seemed almost to slither of its own accord. I lowered myself upon Anne, my member slithering itself inside her with more ease than possible as a human. Once in Anne, it seemed to extend within her and she hissed and twitched with pleasure. If I wasn't completely snake, it seemed I had now the best snake of all and it was now inside my snake-girlfriend.