Castiel & Leonard Snart
Castiel had been monogamous with Blake, but now that Blake had been sent home? He didn't see the point. It wasn't as like he was in a relationship at the moment, so he felt that he could sleep with anyone he wished. And Leonard seemed to be perfectly willing to oblige.
He flashed the man a small smile, "That sounds like a wonderful plan." Because that implied they'd be having more sex than just once. And Castiel was more than willing to have sex with this man multiple times.
As long as the first time was good, of course. Which he had a feeling it would be.
"Are you going to the after party, or would you rather go home after the night ends?"