You look up from David's palm at the two of them as they exchange glances. You grow more and more nervous at the tense silence between the two of them, which is then broken by your mother. "You know what, Dave. Have a blast with him. Oh, and if you want, try to get Stacey in on the fun, and as for you..." Your mother looms over David's palm, with you in it. She is silent for a moment, then smiles, "You do what David tells you, otherwise, well, we all know how sex-crazed Michelle is. If David tells me you haven't been doing what he tells you to, I'll shrink you to the size of a peppergrain, and let Michelle lose you up her snatch for a week."
You shudder at the thought of being that small, nevermind being lost up your sister for a week. You nod in understanding, not wanting to try her patience with a spoken answer. Once she's assured that you understand the stakes, she turns and leaves, leaving you in the palm of your giant brother, who had a smirk on his face as ideas ran through his head.
"You know what, bug. When Stacey and I are done with you, I'm going to tell mom that you didn't behave. I want to see her give you to Michelle, and I want to know that you're that tiny, deep in that little twirp's twat." David bellows as he makes his way to his room.
"No! I'll do whatever you say!" you yell, and he laughs, "Oh I know you will, but that doesn't change the fact that when I'm done with you, you're going to be relocating inside Michelle." He closes his bedroom door behind him, and with his free hand begins to undo his belt and pants. "Let's see, first off, let's lose some of that height. You're way too tall for your first punishment." He concentrates on your form, and you feel yourself shrinking down further and further. The landscape of David's palm expands around you as you get smaller and smaller, finally stopping at around an inch tall.
"There we go..." He puts you down on a counter-top, then immediately rolls down his boxers and gives you a sight you never wanted to see. David unveils his enormous penis, and plops it down on the counter-top next to you. The mammoth organ was as tall laying down as you were standing up, and was quite erect. "Okay pipsqueek, here's your first ordeal..."
"First?!" you question, which brings a chuckle from your goliath brother, "Yup. First, shorty, you are going to have sex with my piss slit."
You turn a paler shade, and shake your head, casting a glance over at the massive penis. At your current size, it seemed possible, but it was a thought you really didn't want to have. A huge fingertip from behind you started to push you towards his massive cock, the bulbous head of which throbbed as you got nearer. "Just stick your little dust-speck of a cock inside my massive cock, and it'll get a lot easier. Fuck around, though, and things will get a lot worse."
You are pressed forward until you are in contact with his massive bulb, and struggle against his single finger. He pushes against your tiny hips, wanting to feel your tiny dick slide inside his piss slit. "Running out of patience, tiny. Do what I say, or I'll shrink you so tiny that you'll be as tall as my piss slit, and then I'll just feed you to my cock."
That revelation almost scares the fight out of you... You can't believe the situation you're in. The horror of this entire ordeal just hits you as your giant brother is trying to literally get you to fuck his own dick. What's worse, if you don't overcome your own disgust and give David what he wants, he's threatened to feed you to his dick...