Sam Winchester & Rosa Diaz
People, well one person who didn't know well enough, or maybe knew her too well, to fear for his life,had tried telling her she didn't have to when Rosa decided she had to sleep with someone. Her response was invariably something along the lines of 'no I'm gonna'.
There was just something about some guys. Always the screwed up ones.
"Yeah. Okay." Annoyingly, Rosa actually cared if he did.