Denji's a little startled when he's lifted, shooting a suspicious, curious glare down at Shidou—but that's quickly dissolved when Shidou really goes at it, knocking Denji's head right back with a groan and a curl of his toes. He doesn't even mind Shidou's grabby hands.

Why, of all people, did he have to apparently like butt stuff so much? This was not something he needed to know about himself. He startles again when Shidou probs his hole with his tongue, but shamefully, doesn't protest. It's just been getting better, and Shidou's a PHD slut, so...

Subconsciously, Denji rocks slightly against that sensation, groaning behind a bit lower lip.

"Fffuuuck."

Denji's cock drools on his belly, throbbing languidly now and again with the attention he's getting to his ass.

"I r-really...like this..."