You think it over for a second, then smile "Sure, sweety! I suppose it could be fun to be small for the day. Just don't hurt me, ok?"
She giggles softly, and plants a kiss on your lips, then whispers, as she crawls into your lap "Don't worry! THis potion also makes you industructable! I mean, you'll feel pain and everything still, but you can't be killed or have broken bones or any of that" She ruffles your hair, then undoes the vile and holds it to your lips "Bottoms up!" She giggles.
You drink down the liquide in a single gulp...It tastes kind of like cherries. She crawls off your lap and sits next to you, waiting. Soon you begin to feel weird, and your body feels cold. YOur clothes, the couch, the room, and Alisa quickly begin to expand, until you look like a baby wearing a grown man's clothes. She giggles and strips you, pulling you into her lap and kissing the top of your head "It'll take a few minutes before you shrink the rest of the way...Oh yeah, I forgot to tell you, James, the effects are irreversable. You'll be a tiny man forever!"
These words strike you cold, running straight to your heart. You look up at her large, beautiful face, and swallow hard "F...Forever...?"
She nods gleefully...This is all a big game to her! You're scared now of what she will do to you. You try to get away but it's useless. She's more than 3 times your size, and you're nothing more than a baby to her. You sigh and hug her the best you can, burrying your face in her showing cleavage. "I love you, Alisa" you whisper softly, before the effects take place again. Your body grows smaller and smaller until you're now in between her soft, warm, well tanned breasts. She looks down at you and giggles at your 1 inch form "Now now, we can't have you in there...Yet" She plucks you, carelessly, from your warm home and holds you in her massive hand, holding you up to her billboard sized face. "Now, what do we do with you first?"