Su-jin was a biter himself, so he was ecstatic to be on the receiving side. Even if the marks didn't last, he and Silvio knew they'd been there. Every graze of his wolf's teeth sent jolts of electricity running over his skin. As things grew more energetic, his hands moved across Silvio's broad shoulders, those too-long nails scraping across the other's skin. They were sharp enough to draw blood if he wasn't careful, but he had enough sense not to tear into Silvio's flesh. He's learned at least that much control in his long life.

Oh, wait. Was he supposed to actually say something in return? Did moaning count?