It's Kimetsu no Yaiba X Male Reader. Pretty straight forward. Male X Female.

A fan fiction story of Kocho Shinobu (The Insect Pillar) and the Half Demon Half Human Reader. The reader is a Male Half Demon and half human demon slayer. Likes: The Pillers, Shinobu, Tanjiro, Kanao, Giyu and the demon slaying corps, also his deceased demon slaying father. Dislikes: His demon mother (keeps reminding him that he will be always in her shadow), the uppermoon demons and demons in general. Please note that there will be some spoilers ahead and there maby some light grotesque scenes. Please watch at your own discretion.

the title speaks for itself, it this turns out unsuccessful then so be it, but at the same time please join

Demons...Beasts that feed of the flesh of the living, and torment the innocent when the moon is out. They are creatures of the night who know nothing but feeding off the innocent and forever slaughtering the lives of many. In retaliation, an unacknowledged regime, which would later turn into an army of legend, of elite swordsmen were created in order to battle and destroy the demons who torment the lives of humans. They were known as the Demon Slayers. For over a century the Demon slayers have protected humanity from the horrors Demons, but even with their best, they could not protect everyone. One night, on a full moon, a small platoon of Demon Slayers were sent to investigate strange occurrences of demons being killed and left out on the road in a village. What they encounter on their mission though will change the battleground of Demon Slayers vs Demons heavily...