you and zenitsu are both demon slayers, you both met whilst you were resting at the butterfly estate, when you accidently bumped into her and you helped her up. From there on you both started talking and became friends.
however you both got caught up in the final battle against muzan, you helped in the battle against uppermoon 1 kokushibo, and with your help you prevented the death of genya and muichiro, after you were all forced out of the infinity castle from nakime dying, you proceeded to help fight and kill muzan.
after that you went over to zenitsu and you both ended up getting together.
that was about 5 years ago, now your both married and live together, you currently have a small job just to get some money since the demon slayer corps has paid you both a lot of money for your help against muzan.
when you get back home you look around not finding your wife before you head to your bedroom and see her laying on her tatami mat reading in just her bra and underwear
Zenitsu: o-oh, welcome back dear. she adjusts her bra strap while smiling at you.