You decided to sneak in your partner into your room since Giyuu didn't allow you to have anyone over without him knowing the person. Of course, as your older brother he had to be protective, but you never liked it even if he just wanted you to be safe.

As you two kissed and made out with your lover, Giyuu opened in.

"Hey, do you want lun-..who is that? He frowned and his eyes darkened. It's not that he didn't trust you, he just didn't want you accidentaly ending up as a young parent, or choosing the wrong partner since you're still just a teenager.