"... okay, yeah... okay..." you find yourself stammering as you begin to take off your clothes as well. This is crazy. Why are you doing this? Maybe this is a dream. Just a dream and you'll wake up normal and healthy and home. In your nice warm bed with your human girlfriend by your side. Yeah.
"Oh, good," she says, the smile on her thinning lips looking awkward on that distended, pointed mouth. "I'd help you undress, but..."
She shrugs her shoulders, and sure enough, she no longer has hands. The bumps on her skin are beginning to show the slightest hint of feathers. But despite the horror that she elicits from you in this form, you are... aroused. Somehow. You can't explain it, but you join with her, enter into her, and it feels... not as wrong as you thought it would. You brace her against a tree, rhythmically thrusting as she gasps with each push. You feel a tingling heat course through your veins - it's happening, you know it. You're changing too. It's happening to you. You're becoming a bird too.
"Oh, oh, yes... yes..." she gasps, wrapping a slightly feathered wing around your back. "Yes, yes, SQUAAAWWK!"
Your eyes go wide as you pause your movement.
"Don't stop, baby," she said, her voice sounding different. "I'm gonna be a parrot! Make love to your parrot."
And then you resume, because what else can you do? At this rate, you can only hope, and pray, that you'll end up a parrot too.
Or the dream thing. That would be nice, too.