"You must!"

"May I touch?" you ask Casey and she nods.

"Of course you maaa... you must tough them, now." she huffs under her breath. "I... I demand it!"

You lean in to inspect them, carressing the underboob tissue which is surprisingly tough. You place your other hand under your own boobs to confirm how pliable that part of a bosom should be. When pressed or kneaded, Casey's breasts are reacting strange. As if right underneath the soft skin, there was a thick leather bra preventing you from pressing into the boobflesh deeper. Or multiple leather bras?

Casey sighs contently. "This tickles." She giggles softly. "In a good way. Like nippleplay." she touches her nipples, pinching them, and you both fumble as the four hands rival over the generous territory.

You decide to brush your tongue-cock against the underside of her boobs. As it slides along the sweaty yet velvety skin, Casey gasps. "More" she whispers, and her hands reach out to return the favor on your own breasts. You breathe heavily as her fingers roam your body, but she is clearly more electrized by your deft moves. Your tock poking around her tits seems to arouse her more than you think it should. In another swift decision, you go for her nipples next, rubbing them between your thumb and index finger.

And now it happens. Casey moans loudly, and her breasts shift. Before your eyes, her nipples elongate like stiff tiny penises, and grow. And grow. And grow longer, while Casey continues to moan. You hold your hand beside the nipples, they are still thinner than your pinky finger, but longer than your hand.

"Whuahh" Casey moans, grabbing your hands and moving them to her tits which you had let go now. "Fondle."

You do so, but also try and pinch the nipple-erection that is jutting out of her tit, to see how much Casey can feel your pinch. "OUCH!" - okay, she has definitely some feeling in these extraordinary nipples... and then the other nipple swats your pinching fingers away. Bash... she moved the other nipple as if she had a muscle in it. You lean back a bit, but remain in arms length, staring at the sight.

Casey stares down at her breasts as well, her eyes full of surprise now. Then her hands swoop back to carress her new extensions. "Ohhh that feels so gooo..." she brushes the sensitive thin muscles and then she carefully begins twitching the half-meter long appendages. Like... tentacles. "This is... amazing!" she waves her rosy-red nipples through the air in slow figures. Your eyes are level with her breasts, so you have also a clear vision of where the nipples emerge from. Casey's full breasts are gone, replaced with A-cups at best. As if all the strange muscle-tissue she had there just a few minutes ago, had moved into the erupting whip-like tentacles.

"Let's call them nip-tacles." you manage. Casey's attention returns from her niptacles and they shoot out, grabbing you by the tock. "Let's not." she suggests, while squeezing and dragging your face by your tock onto her now flat chest. Her grip strength in the silky-smooth niptacles is weak but determined, so you oblige and rest your chin on her breastbone, your niptacle-grabbed tock now almost touching her lips.

But now, Casey looks down again and apparently notices her flat chest for the first time. Her niptacles let go of your tock as she freezes and pushes you away. "Omigod what happened to my tits!" Casey begins to panic, and to your amazement you see her niptacles spooling back into her chests, filling them up again. It's not really spooling though... it's more like her whip-tentacle muscles are going slack and flaccid and flow back into Casey's ample bosom.

You reach out and embrace her in what you hope is a calming gesture. "Your tits are still there. They're just different now." You tease her long nipples a bit with your fingers, but the niptacles don't re-emerge yet.

And Casey really calmed down like you intended, snuggling her face into your shoulder. "Hmm that feels good. Just hold me a bit." So you do just that, until Casey begins to softly snore in your arms. Her breasts remain firm and round now. But you know already that she's going to experiment a lot with her new toys tomorrow.