You knew your brother was up to something. You could see that your orange juice looked slightly different than the glass at your brother's place. He's been riding your ass for weeks, you figure he's slipped something in your oj. As soon as, your brother turns away for a second to grab a banana from the counter, you switch the glasses.
Then you pick up the glass and drain it. The oj does taste chalky, probably your brother got that Calcium enriched stuff. You grin up at your brother as he grins down at you. He sips the glass of OJ at his place.
"So what did you do with the tuition money that gramps sent?"
"The money?"
"Yeah, the university sent back last semester's check with a letter confirming that you'd dropped out months ago. So what did you do with the tuition money?"
You notice that your brother is starting to take off his clothes. You grin when you see his red Speedo.
"Lost it gambling."
"How much did you lose?"
"30 grand, but I'll make it back with interest. All I need is 5 grand."
"Still gambling after losing $30,000!"
"Oh, it's not a gamble it's a sure thing. 10 to one odds, 5 grand makes me 50 grand. If you'll give me 5 g's, I'll give you 5% of my winnings."
"Idiot. No wonder you lost 30 grand. You offer me $2500 for a $5000 investment!"
Your brother shakes his head and drains his glass of orange juice.
"Oh, yeah 5% of $50,000 is only $2500!" you say smacking your head, "Of course, I knew that bro, just checking to see if you were paying attention."
"The way you pay attention to those guys at the gay beach? I followed you the other day, and saw you lounging in that hammock all day."
"I'm not gay!" you protest, and then add angrily, "You followed me?"
"You're going to have a chance to lounge around in a hammock," your brother says nodding significantly at your empty orange juice glass, and he snaps his red Speedo's waistband. "You just drank a glass full of nanobots. They're already working to shrink you down from 6 feet to six inches. Then you'll be lounging in my banana hammock. You'll be going to classes with me, and you better pay attention, as I will be testing you. Oh, and instead of having those gay guys sucking your cock, you're going to be sucking my cock. As incentive, you'll be shrinking down to 0.41 inches tomorrow if you don't do it today. Ingesting my cum will make you grow .41 inches. If you disobey, I'll withhold my cum and you'll shrink back. It'll take months, maybe years, but eventually, you'll grow back."
Your brother rubs the side of his temple. He looks flushed and dizzy. His red Speedo looks a bit loose, and suddenly it drops to his ankles.
"What?"
"Oh, whiz kid, haven't you figured it out yet? I switched glasses with you. You drank those ninny bots."
"Nanobots," he corrects. His eyes widen, and suddenly he's plummeting downward into silky red Speedo at his shrinking feet.
You get up from the table and tower your naked body over your six inch tall brother. You slam your feet down on either side of him slipping your feet through the leg holes of the Speedo and lifting it up to your knees with your brother on his naked butt in the Speedo's pouch.
"Wicked idea, bro, I like it, and I like your swimsuit. Hope you enjoy your new hammock," you say pulling it up as he screams incoherent protests.
You grin and sit back down and finish your breakfast, as your "little" brother squirms in your Speedo. You pop a boner.