As your sister stands up she quickly snatches the gun from your grasp.
"Hey, wait! What are you doing?!" You yelled as you lunged for the breastinator. Sarah smoothly sidesteps out of the way while you dive head-first into your bed.
As you recover you hear a concerning giggling behind you. Turning over, you see your sister, Sarah standing over you with the gun pointed between your legs.
"W...wait. Hold on Sarah. A..are you...you aren't about to..."
She smiled teasingly. "Hey, I just thought it would be a waste to change just your balls but not your dick. Why not go all the way? Besides, it's not like you'll be needing it any time soon, right?"
You blush at her last remark. It was true that you were still a virgin, and didn't have a girlfriend, but...
"Look, I still need this okay? It's my mark of manhood and..well..." You blush again.
*Giggle* "Don't worry. I know about your 'activities'. You're lucky I haven't told mom yet." She pauses for a moment before her grin widens to disturbing levels. "I know! Why don't you start jerking off right now? Isn't this usually when you start doing so anyway?"
Your heart starts racing. She wasn't really going to make you do this was she? Your sister of all people?
"Holy sh*t Sarah. I'm your brother. There's no way I'd do that...in front of you."
"Oh, don't be that way. We're twins. It's not like I don't see it often enough. It's just...another bodily function, right? Like pissing." She finishes with a smirk.
"Now come on big bro, before I start shooting more vital body parts." As she says this, she points the gun at your head.
While you'd rather not have a breast for a head, you'd like it even less to have a breast for a dick. You glance down at your manhood, then back to Sarah. The look of determination on her face tells you all you need to know.
Reluctantly you reach between your legs, grasping your flaccid cock.
"Ah, there you go. Now, enjoy it while you can, brother. It'll be a while before I feel like turning it back."
Soon, your gentle fondling brings your cock to full erection. Your remove your hand for a moment, spit in it, and continue.
As your stroke your cock, you almost feel like crying. Your sister is standing above you, sadistic grin and all, getting ready to fire at your cock the moment you reach orgasm.
"Are you seriously going to cry?! Good lord Joe, I thought you were more man than this. I guess you really didn't deserve that cock did you?"
Now you really were crying.
As you grew closer to cumming, you began letting out soft moans. The movement of your hand grew swifter as you felt pressure building up at the base of your dick. But just as you came, you were blinded by a flash of bright light. When you opened your eyes again, you had the perfect view of your malforming cock.
It began with your cock-head, as it grew pink and rather puffy. The sensation of pleasure intensified as it, and the flesh of your shaft, grew soft and smooth, the wrinkles and veins smoothing out and disappearing. You cried out and grasped your cock desperately as it began to swell and grow flaccid beneath your hands. Having lost all sense of reason, you stroked yourself furiously, not wanting to miss your final orgasm. Within seconds, you felt electricity shoot through your body as your transforming cock, twitching wildly, shot out a mixture of cum and milk. You scream now, while the most powerful orgasm you've ever felt tears its way through you body. Your head goes numb, the sensation in your cock grows dim, and your sister, now crouched between your legs, is fondling your dick as the changes near completion.
As the pounding in your head grows, and your vision fades, you see the final remnants or your cock, the head, squash down and settle at the front of your new breast as a cute, little pink nipple. The last thing you remember before blacking out is Sarah's maniacal laughter.
A few hours you awaken, lying your own bed, to see...