You haven't had any luck in love, so you decide to enter the demon slayer corp where you become very good friends with Obanai and sanemi, but after a while you started to fall in love with them....But no one knows, one day you were walking through the hallways and there are sanmei and Obanai kissing...

sanmei sees you but he doesn't care about you and continues kissing Obanai. Sanmei seemed neutral as always

Sanmei: “mmh..~”

*Obanai doesn't see you and keeps kissing sanmei. Though if obanai noticed you he probably wouldn’t get embarrassed or care much.”