Cas's eyes harden
Cas: Did Katsuki do something?
Cas grabs Ren by the shirt collar and pins him against the wall
Cas: Tell me.
Cas kisses Ren
He checks to make sure there's no one around then pulls Ren up and grabs him by his thighs, wrapping them around his waist. He slips some tongue into the kiss
Cas pulls away, blushing a little