Seiteki na Ijime Desu ka? Iie, Gohoubi Desu! ~Gakuen no Idol-tachi ni Niku Vibe Atsukai de Sukikatte Seieki o Shiboritorareru Seikatsu~

Guys are herbivores, girls are carnivores in modern Japan.
Three female students rule over a boy at Academy of Cursed Top with sexual harassment.
When they discover his big dick he becomes a living sex doll for their whims!

Girl-on-guy persecution! Male masochism under the cruel sexual tyranny of women!
It's not torment, it's a reward.

[From DLsite English]