Atsumu and Osamu sit next to each other in class and always give stealthy handjob to each other whenever the lesson starts to get too boring.

They are also the type who sneak under the dinner table to give the other a blow job during family dinner. The one who breaks the hardest will get fucked later.

"Oops, I dropped something," Atsumu says and Osamu knows that the next thing, he will have his pants and underwear being pulled off and his brother's warm mouth will engulf him.

It is so hard to keep staying in the conversation that his mom and dad are engaging him in when he has his dick being sucked so good. He also can't help but thrust into Atsumu's mouth because Atsumu is always asking for it.

Sometimes Atsumu even plays with his ass, fingering him there while sucking on his balls and licking his shaft, and Osamu is so done. He will spill everything into Atsumu's throat, and then Atsumu will emerge from under the table, looking smug.

The revenge will be next day in class. When the lesson gets boring, Osamu will slip his hand into Atsumu's pants and start jerking him off. He loves to watch Atsumu grips his pen so hard to remain calm while he thrusts himself against Osamu's palm.

They are sitting in the back corner of the class, so it's even easier to get Atsumu's pants down slightly so Osamu can reach his ass too, smearing Atsumu's precum into his asshole.

When Atsumu comes, it's always messy and he needs to rush to the bathroom to change (the reason why the twins always bring spare clothes with them to school)

In the bathroom though, Osamu will fuck him first before letting his brother cleans up.