I can maybe keep the idea of Hakuri grinding his cute little dick on his big brother's to get off. Soya teases him until he's hard, then forces him to do it while watching and getting stirred up himself. When Hakuri has a dry orgasm, Soya is enamored and... hmm, I wonder?

"No one else will ever have you. Nii-chan will give you all the love you need."

His promise fell on deaf ears but it didn't matter. Hakuri wouldn't ever think to defy his strong big brother.

"Nii-chan loves you Hakuri. You're the best. We'll sleep together a lot from now on."

His quiet declaration echoed faintly off the tile. No matter what he had to do to help Hakuri train, he'd make sure his little brother stayed adorable and cute. Sweet, sexy, obedient Hakuri, his forever...

This was the start of something new, Soya thought while he soaked in the tub with Hakuri's little chest steadily rising and falling below him. He shifted so his now-flaccid cock rubbed against Hakuri's ass and shuddered. Something he'd have to work hard to hide, but totally worth the effort.

Soya chuckled and sat up, keeping Hakuri close. He rubbed some small circles into his back while babbling some reassuring nonsense, calming Hakuri down until he could re-dress and tiredly follow him to the family bathroom. He was quiet while Soya rubbed him down, even when his dick was teased.

Soya pulled him in for another kiss, deep and intimate. His skin tingled wherever they connected. "It's okay. Nii-chan will clean up and we'll go to sleep. How about a bath first? Do you want your big brother to scrub you clean?"

Hakuri made noise of agreement and nodded into his shoulder.

"Nii-chan? Are you okay? Did I hurt you?"

He cupped Hakuri's tearful face in his hands and sighed contentedly. "No. You did amazing... Nii-chan's never felt this good, ever..."

Hakuri sniffled and nodded. The last bit of pee finally dribbled out of him and he slumped, seemingly ready to collapse.

thrusting wildly until-

"Ah, Hakuri...!"

He cried his little brother's name as white liquid finally shot out of him. Hakuri sat uneasily atop him as he trembled and moaned while the pleasure rocked him tip to toe. This was the best he'd ever felt. His little brother was the key to happiness!

let go, the pee warming his stomach and dick, the sound of something so shameful happening where only he could see it- he'd forced his little brother to have an accident on him!- it was perfect. His body thrummed with pleasure and Soya ground hard. Hakuri just kept going and going and he kept-

"It's okay. Just go pee," Soya half-demanded, half-begged. "Nii-chan wants to watch you go."

"...Okay. I'm going, nii-chan..."

Soya caught a deep moan in his throat as Hakuri's warm little dribbles turned into a steady stream that glimmered in the low light. Hakuri's little sigh as he finally-

"Then you should go before you sleep, right? You don't want to have an accident."

"But..."Hakuri's eyes watered and a tear fell. "I'll make a big mess on you..."

"You can't hold it anyway, right? Look, you started so it has to come out."

Hakuri looked down and moaned a little as more spurted out.

"Okay..." Hakuri took his little dick between his fingers and squeezed his eyes shut. "...It's coming out..."

A small spurt splashed on his his crotch, then another. Hakuri was struggling with shyness and Soya's heart leapt. Too cute!

"How much do you have?" he asked breathlessly.

"...A lot."

He was close to cumming but it was too dry. He needed something wet.

"Do you need to pee, Hakuri?"

"Eh? Um..." Hakuri blushed again and looked away, but nodded. "I do..."

"Then go."

"But it's weird..."

"Just go pee. I won't get mad. I need it," Soya breathed. Was he really going to beg?

"Nii-chan, this is scary!"

"Shh. I'll be better soon..."

Hakuri's eyes were welling with tears again. He was so easily frightened, Soya sometimes wondered if they really were related. He'd toughen him up more tomorrow. For now, right here, he wanted...

"Ngh... Hakuri...!"

"Nii-chan?"

"Take off your kimono."

"Um, okay..." Obedient as ever, Hakuri shrugged out of his clothes and undid the obi so that he was completely naked. Soya watched his little brother's immature dick bounce up and down as his own started to weep a clear liquid. Soya gripped him harder and started to buck.

"Wh-What are you-"

"Shh. You'll feel like this too when you're older. All boys do. Just stay where you are, it won't hurt. Promise," Soya said. The fabric of their kimono was in the way but it still felt good. Hakuri's little balls rubbed up and down his shaft. His shy expression egged Soya on.