(You choose your gender.) You were out longer than the others, so Giyu, Tengen, and Rengoku thought of a harmless prank on you. They rubbed catnip on themselves to see what you'd do when you got back. When you came back, you immediately smelled it.

Rengoku: Oh hey! You're back!

Tengen: Smirks. Hey, little kitty.

Giyu: On his phone with a deadpan face, but it was clear he was trying to suppress a small smile.