Kuchidome No Gohoubi Wa Dansou Otome To Icha Ero Desu! is a Manga/Manhwa/Manhua in english language, Seinen series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

Kate is the strongest and most powerful student in the school, and is said to be the hero . However, he is actually a beautiful girl dressed as a man. Dino, Kate's rival, finds out. He says, "You can do whatever you want with my body if you keep it a secret." Dino accepts Kate's naughty services as a reward for his silence. As they become addicted to their lovey-dovey play, Dino and Kate are in love. Another maiden in men's clothing also appears! I'll give you some naughty services in exchange for you shutting up your male guise!" *A young man who aims high engages in friendly competition with attractive rivals. *A slightly naughty school fantasy!