"Ok!" You say, "I found this thing at a store. I had wanted to give you better... Uh... Sex... You know? I wanted you to enjoy yourself and I accidentally put it on blue instead of pink."
Your girlfriend mulls this over. "So blue is male and pink is female?". She wins the light at you, stepping back a little.
"Wait! Don't!"
Melissa hisses a little and spits, "You don't get the right to argue. You changed me without permission."
You are a little deflated and close your eyes. "Alright. Let's get it over with."
You wait on pins and needles. You wait for something to happen. Finally you hear Melissa gasp and open your eyes. You look down. You're the same as you always were, just as feminine and beautiful as ever. You instinctively reach for your crotch, thinking she may have given you a penis too, outlet of revenge. Nope. You're the same girl as you always were. You look at Melissa with a question in your eyes. "What did you change, sexy?"
Melissa can't answer. She is too shocked. You caress her breasts and lean in for a kiss. "I thought you were going to give me a penis too. I would like to find out how it feels, you know..."
Wordlessly, Melissa pulls you back onto the bed, kissing you, groping and moaning as you do the same back. You both are exited. Her dick is rock hard and you are dripping with anticipation.
"Fuck me! I know you want to, let's do it!" You moan.
Melissa rubs her dick over your wet pussy, gasping for a moment. She jumps up and dashes to the washroom. You watch with bemused arousal. Her sexy tits bounce with her hard dick as she runs. You hear water running and then a little noise, wondering what she could be doing. Eventually she returns.
"Sorry, hun. I needed to wash it off. I didn't want you to get an infection.". You nod and smile, caressing her again.
"I want you in me!" You moan. Your nipples are hard, grinding into hers as she lines up. You gasp as you feel the head playing at the entrance of your sex. You bite her nipple playfully and it sets off an explosive reaction. She begins to penetrate slowly and gently, moaning and gasping. You begin working out the rhythm. She thrusts and you buck your hips. She speeds up and you match. Soon you feel the climax edging into your pussy, your toes tingle and you bite harder, nuzzling and nibbling at the flesh between her breasts, knowing how good that feels to you. She cries out in extacy thrusting deeply. You feel her dick swelling a bit and then a flow of warmth inside you. It's too much. You come hard.
You lay there gasping. You feel her dick softening in your pussy and grin, playfully nibbling Melissa's neck. "See? Wouldn't it be fun if we could both do that? Why don't you get a pussy and I can get a penis and then we can see what happens?"
Melissa was too weak to argue. She nodded and continued to pant softly. You reach for the flashlight...