Gen didn't exactly have a sixth sense about when Senku was in a bad mood. It'd be useful, of course - he'd be braced for a large project in the village or onboard the Perseus if he knew Senku needed to get something worked out of his system.

But he was his closest friend and there's just not that many places to look on a train if he wanted to hang out with him. Gen recognized a particular non-expression on Senku's face as he walked with his markers toward the quiet cars, and.

Whose beds did he need to short-sheet? Gen was technically a pacifist but he could and would make someone's life hell.

He followed Senku into the quiet car without a word, slipping inside if he wasn't stopped with a cheeky little smile.