At first, you want no part of this, because doing sexual things with your sister is way out of line, but you slowly start to factor in a few more things. For one, you've never had any girlfriends and never experienced anything sexual. Now that you're only three inches, you might be stuck like this forever. If you are, you may never be able to leave the house again. Your sex crazed sister might be the only way you can experience these things. Plus, being three inches tall might make it fun. She's like a giant landscape, looking even hotter than she does when you're normal size. Maybe you can push past the fact that she's your sister. You sigh. "OK, Hilary. I admit that your breasts are comfortable and fun. You're like giant hills to me at this size. I... I'd like to see a different part of them."
Hilary squeals with glee and bounces. It causes you to cling your arms against her giant thumb as she jumps up and down. You also catch sight of her bouncing F cup breasts! If nose bleeding could really happen like they do in anime (though they really can't, because nose bleeding is put in the cartoon in place of erections, because erections in a cartoon could scar a kid), you'd be having a nose bleed right now. But instead, you feel an erection coming along and poking against her thumb. You hope your sister doesn't notice, but she suddenly stops bouncing and stops smiling. You gulp, hoping your erection dies down soon, but it's still poking against her thumb. She feels! She feels it!
Hilary raises one eyebrow. "Is that you I feel down there, Matt?"
You burst out and admit it, "Yes, it's me, Hilary. I'm sorry. I-"
Hilary giggles. "No need to be sorry, little Matt. It only means you think I'm sexy. It's a complement, really. And now you'll get to get up close and personal with my huge breasts. But first." She sets you down on the bed and you cover up what you can of your erection, because you're clothes didn't shrink with you at all. She giggles again. "Awww, you're so cute, Matt, but you don't need to cover yourself up. I've seen erections before." You very slowly uncover yourself and Hilary bends down close so that her giant head is right in front of you with her chin against the mattress. "You're so cute, little Matt." She reaches and caresses the underside of your erection in one single stroke. The contact causes your whole body to quiver with pleasure. "Now, Let's get to it."
Hilary stands up to her impressive height and takes two steps back. She then slides the right strap of her tank top off her shoulder and then the other one very slowly. She rocks from side to side slowly and seductively as she slides her tank top down just enough to show more cleavage and show you there is no bra beneath. You mouth drops and you erection gets harder. "Are you ready to see my big beauties, Matt?" Hilary asks while grabbing her breasts and pushing them together sand bouncing them up and down. You nod eagerly. The grins and grips the the bottom of her tank top. She very gradually lifted up her body, still rocking and swaying her hips sexily. It feels like hours of anticipation, though it only takes a minute or so, but she takes off her tank top revealing her perfectly dome shaped F breasts. They look perfectly round and firm, like they are the result of a great plastic surgeon, but these aren't implants. Believe it or not, these are her natural breasts! All you can do is stare and gawk at the massive breasts. She was right. They are beauties indeed.
"Are you ready to get a closer look, little Matt?"
You nod even more eagerly that before, you erection pulsating now.
She gently picks you up with just two fingers and lays on her back in her bed. She then places you on her right breast right next to her nipple. "Go ahead and have as much fun as you'd like," Hilary encourages.
You...