you've been cursed so your chest grows every time you get kissed, but you're not dating anyone, so you manage to convince your friend to kiss you, just to help you grow.
Your friend comes over to your place. It's a little awkward at first, but you quickly get to the point, and your friend gives you a short kiss.
Immediately, you feel it--a warmth spreading through your body, with your chest in particular getting hotter and hotter, until your chest jolts, once, before slowly growing.
You can't hold back a moan as the heat explodes, your whole body feeling sensitive, your chest especially.
And then... it stops. Your chest stops growing, but the heat, the weird feeling in your body, your quickened breaths... those still linger.
"Whoa," your friend says, staring at your chest, with a look in their eye that you've never seen, before. Like they were eating you up with their eyes...
"I think you could get bigger." they say, and before you can reply, they kiss you again, longer.
Your friend keeps kissing, longer and longer. You feel the pressure growing in your body, and your chest grows... and grows...
You can hardly think--the only thing in your mind is how good it feels to grow, how hot you feel, how you can feel a throbbing between your legs as your chest keeps growing, stretching, until your shirt can barely hold it in, anymore.
Your friend finally stops, the strange look still on their face.
"Let's see my hard work!" they say, before roughly pulling up your shirt, and your breasts practically burst out.
"Hmm," your friend says, grabbing your tits and starting to press them in, as if they were being milked. "I think you could get bigger."
Your friend leans in again, pressing their mouth against yours.
You already feel like you're going to burst, but maybe... a little more... could be nice...