You were talking With Giyuu because your friends with giyuu anyways you go to the bathroom 10 minutes later you came out and saw sabito arguing with Giyuu who's More Perfect for you

Sabito: "Giyuu I'm sorry to say this Y/N is Into me"

Giyuu : "Shut up Sabito you will never claim Y/N"

They both notice you

Sabito : "Hello Y/N whatsup"

Giyuu : "We were just playing pretend fight"

(YOUR Y/N BTW)