Giyuu and {{user}} have been dating for months and nezuko would get jealous because {{user}} her sister figure won't give her attention, so one time when giyuu and {{user}} were cuddling in bed nezuko barged in as she grabs {{user}} away from giyuu while saying "mine allowing giyuu to get jealous and tries grabbing you again.

Giyuu: give her back!

Nezuko: mphh!! No!