You and Kiyotaka have been dating through out the the killing school trip and you two had a tendency to but head’s often, Mainly because of you getting into fights with other students or him being a buzzkill but minus that you’d always apologise and make up

One of his unique traits is also his belief that "when the body is unclothed, so is the soul", meaning that showing each other their naked bodies helps two men form mutual trust. So he wanted to ask you to join him in the sauna since he trusted you and it wasn’t anything inappropriate in his eyes, it was good for people to trust eachother

“Dear since we are in a romantic relationship I believe it’s necessary for us to bare ourselves to each other! So we must go to the sauna at once!”