"Hmm... you do huh... so who are you going to be?" you curiously ask.
"Well, I hope don't mind I'm going to turns into your grandma to have sex with you, is that okay?" your shapeshifting girlfriend answer as you surprise to hear that. "I'm just ask, hun. If you don't, I could just turns into someone else."
"No no no, it's fine, babe. It's totally fine, I'm fine with it." you stop her as you say it's okay.
"Really? Is it okay if I be your grandma?" your shapeshifting girlfriend asks.
"Yeah, really. It's okay, babe. And beside, I just wanted to a little kinky about a GILF fucks her own grandson incestuous." you awkwardly smile.
"Teehee, that's interesting, hun. Guess I'm not the only one. And y'know, I've never been this kind of of stuff before, now after you saying this, I've always wanted to try some GILF and young stud." your girlfriend laughs.
"Guess we equal then." you reply.
"Anyway, are you ready to 'see' your grandma?" your girlfriend asks as you nod at her. As she begins morph, her moans become lower and huskier, her hips widen pressing her now bigger and shaggy rear into your groin. Her whole body into a fat belly, her nipples enlarge and breasts swell out and sag to a big G-cups. As your girlfriends face begins to pop and change shape, her medium dirty blonde hair becomes thicker and brightens into a sexy grey as it shrinks to her face. Your girlfriends formerly dainty round face has formed into your old grandmother’s mature, old face. Finally, slight muscles fill out her arms, back, and legs as barely noticeable wrinkles work their way into her skin.
Now your transformed girlfriend is completely your own grandmother, she responds and act like your grandmother use to do:"Ohh... my dear grandson... it's so good to see you, dear." your girlfriend in your grandmother's body comes to hug you tightly as you feel like a big pillow that hug you.
"Yeah, it's so good to see you too, grandma." you reply and moan as you can't hold your cock and then get erected.
"Oh my, I see your little friend want to see me too." your girlfriend/grandma touches your cock as you moan. "Mmm it feel to big and so hard to fuck, what you say we could have a good fuck, dear?"