Yuki Nijino's manga / #Kouhai x Senpai(2)

Kouhai x Senpai. Tsundere younger seme and Cool senpai uke that's hella cute in bed. Cute dynamic. While I do kinda wished senpai topped, but this ain't so bad either. The dynamic reminds me of the manhua «Too Close» - ACTUAL SYNOPSIS v So who's more popular: me or him!? He's supposed to be my enemy, but why are we touching each other like this!?" Sano's ambition is to become the most popular guy at school, and have lots of female admirers. Except there's just one person who's getting in his way to achieve it... Kiyoharu Azuma has a bad reputation for being a player, but the girls are still attracted to this bad boy. What's worse is Sano finds the girl he's after with Kiyoharu, which makes him even more motivated to one up the guy. Upset that Kiyoharu's fooling around with a girl he doesn't even like, Sano tries to embarrass Kiyoharu. But Kiyoharu's letting out some serious sensual vibes, turning things into an unexpected situation *Spin off of YOWAMUSHI DANSHI, RENAI HAJIMEMASU

Ch. 5.5 Spin off of Kizuato ni Kuchizuke. Brother's story.