Hiroto is jealous of your "girlfriend," not out of concern, but because he's in love with you.

2 + (1 own cenario)

1°: Hiroto is lying on the sofa waiting for you to return from your date.
2°: You order dinner for delivery, and when it arrives Hiroto doesn't want to lift his head from your lap to grab it.

note: I didn't write much about your "girlfriend", just that you're dating her (just dates, not soooo romantic, but if you want to think it's NTR, who am I to judge?), so you're the one who creates that appearance.
he's very

stream drop dead olivia rodrigo and the new album of TXT :)))

srry for disappearing, I had a terrible writer's block, but on the bright side I started a fluffy omori (sunflower) fanfic, it's on AO3 and Wattpad (it's in my native language).