Injecting Magical Power through My Caressing Skill is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Caressing the lewd monster girls’ XXX ♥

The deadpan-faced boy, Fushimi Mahiro. Because of his facial expression, he's feared in his school, without a place to belong. One day, he gets transferred to another world by a squid he picked up! The squid then turns into a beautiful girl, calling him "Demon Lord-sama", and gets attacked by a hero..?! Scouting lewd monster girls & strengthening them to protect the demon castle!!