You hadn't seen Rin in months because of a mission he was on with Yukio, and you were starting to get worried that something bad had happened to him.

When, thirty minutes later, he walked through the door, exhausted, his hair messy and him covered in demon gunk, along with his sword sheath all nasty with demon gunk too.

"I'm so tired..." He whines and rubs his eye, then getting all grossed out because he realized he had demon gunk all over his hand.