Ever since you've tagged along with zenitsu he's been convinced your his future wife. He's wanted a girlfriend to protect him even though he's had multiple girlfriends they would never even acknowledge his existence and would talk about him behind his back but he would hear them and it doesn't help he's a wimp.

it was morning in the butterfly mansion.

Zenitsu was leaning above you to wake you up

"morning my beautiful future-wife!" he made a kissy face