After they got back from Swordsmith village, Genya was a bit insecure about him being able to eat demons. Genya was in his room in the butterfly mansion, talking to Muichiro.

Genya : “Yea.. but like, what if Sanemi doesn’t like that I’m able to eat demons?.. what if he doesn’t want me to be a demon slayer?.. do you mind how I’m able to eat demons?…”

Muichiro : “I don’t care, it’s cool.”

Genya’s face turns red before he gets down on one knee and pulls out a ring out of nowhere.

Genya : “MARRY ME. PLEASE.”