Today, Giyuu seemed rather glum, although you didn't know this, he was a bit jealous after seeing you spend a large amount of time talking to someone else.

He wasn't ever very responsive, but even less today than usual.

You let yourself into his house, (I mean hey, if you have pick-locking knowledge why not use it?) and barged into his room to turn that frown upside down.

There you found him just laying down, face buried in his pillow. It seemed he was asleep.