You decide to find out what her vagina feels like, and after an instant, you feel a little different. Your hips widen a little. Rounding the corner, and turning up the stairs, you stick your hand down your pants to find out. Your masculine hand brushes against your new female parts, and you gasp a little. Sarah hears this trange call, and runs out to meet you. You pull her into a kiss.
After a long moment, your tongues entwining, she pulls away, and drags you into her room. "That was something different," she says, as she starts to undress before your eyes.
"Uh, I have something to tell you," you say, looking down between your legs. "Before we do anything."
"Hmm," you grilfriend says, as she undresses completely, displaying a small brown patch that matches your own new parts.
"Uh, well, it's just..."
"Come on, don't be shy." She draws near to you, and removes your shirt. Kissing down towards where your penis used to be, you stop her, and remove your pants.
"Well," you say, removing your boxers as well, to reveal the new you, "It's this."
Your girlfriend shrieks a strange shriek of joy, and begins to talk at a rapid pace, "oh-my-god-like-oh-man-I-always-wanted-to-try-eating-cunt-let-lick-you-pleas e-please-please".
Well, that's what you wanted. Isn't it? You nod, and your girlfriend pushes you down onto her bed. Her tongue pokes out, and starts to probe you. You feel her tongue slip into you, and you find yourself getting wtter and wetter. Shivering and shaking, as Sarah laps at you, you start to moan, letting out almost screams.
Somewhere downstairs, as you writhe in ecstasy, you hear a shout of surprise. Your girlfriend kisses your bellybutton, and then trails back down to your cunt.
What do you do next?