"I'm sorry, little brother. Just let me think," Alex said, contemplating how far he was willing to go. All kinds of extreme and kinky fantasies filled his mind, but he wanted something more grounded. At least for now.
He thought of all the things that he loved about his little brother. Why he'd been so eager to fuck a statue of him. Yes, a plan was coming together.
He began work on the chronivac, first changing Tony's body. Tony found himself shrinking, as he began to regress. Alex missed having his adorable playful brother around. All he did now a days was hide away in his room playing video games. Not anymore.
He gave Tony back his penis, however it was now small, even for his new age. And it didn't connect to any of Tony's plumbing. No, Alex wanted to keep Tony constantly horny and needing to pee while never being able to get any relief. Though it would get boring if he was always right on the edge. So he lowered both those settings to be at minimum 75%. This would mean Tony would constantly be horny and want to pee, but still able to function normally day to day. It would also give Alex plenty of opertunity to fill Tony with extra lust.
He upped Tony's sensetivity and lowered his strength. Then turned him back into flesh and bone. The now boy Tony dropped to the floor and staggered with his unfamiliar small body before lunging for the computer. Alex easily caught him and pleased the struggling naked boy into his lap.
"Let go of me you pervert!" Tony shouted, surprising himself with how high his voice had become. He squirmed in his big brother's firm grip. He was so sensetive all over now that just rubbing his back up against his brother's shirt sent shivers down his spine.
" Sh, sh. It's okay," Alex said softly. "I've got you." With his free hand, Alex changed Tony's tight asshole to always be tight but able to streach to accommodate what came next. For his own cock, he removed the vibration function, and just made it rather large. He also changed it so he'd shoot an unnatural abundance of cum, and be able to go many rounds in a row, no problem. He also upped his labedo, and made it so that neither he nor Tony would age or ever get sick, and would recover quickly from any injury. He made himself incredibly fit, like an olimpic swimmer, while Tony would be incredibly flexible.
Next came to social challenges. He made it so everyone would always think the brothers were the ages they appeared even if years passed. Their incest would still be taboo and shameful, but no one would stop them. And they'd all assume it was Tony that had seduced his older brother, and blame him. After all, who could resist someone as adorable as Tony. The same went for any kinky thing they did. If Tony went about naked, they'd all shame him for it, but there'd be no consequences.
Then he changed their rooms and things and house. They now lived in a mansion with a pool and a huge closed off garden. They even had servants. All Alex's clothes were upgraded in a walk-in closet. Similar for Tony's, but his clothes were all made for his age, but either tight, thin or skimpy. Usually all. He had costumes and girl outfits and more. His large bed would be full of teddies larger than he was.
Finally were the mental changes. Tony would be shy to the extreme. Not even able to see himself naked in the mirror without freaking out. As soon as Alex added this change, the boy in his lap began struggling all the more.
"Ah! No! Please! Let me cover myself! Oh god! Alex! No, don't look!" Alex relished his brother's blush. He gave Tony a powerful exhibitionist kink then. Tony kept panicking and begging, but his tiny penis was erect and moans escaped his lips now too.
Alex regressed Tony's mind to better fit his age as well, in fact making sure Tony would act even younger, sucking his thumb and playing with toys. And not understand his emotions or how to cope with them. Tears began to well in the now confused horny boy's eyes. This was all too much for him.
"There there. We'll start over." Alex kissed Tony's forhead. He then made a big change. He made Tony fall in love with him. Despite everything Alex had done to him and was doing to him, Tony's heart began to flutter at being in his lap.
"There we go. You'll be my cute little brother, spying in me with a guilty, incestuous, shameful crush that you won't understand. Submissive and always horny. Easy to manipulate and toy with. This is going to be so much fun." With that, Alex used the chronivac to put Tony to sleep and remove all his memories of ever being something else. Tony wouldn't remember Alex fucking him, or being a statue or the chronivac.
Tony goes limp in his big brother's strong arms. Alex gently carries the naked boy back to his overly childish room, and pleases him in his fluffy bed, in between the giant teddies and pillows. Alex runs a hand across Tony's hairless and flawless smooth skin. Over his sensetive nipples and tiny penis, and down his slim legs. Then he leaves.