Sex motivation: Nate

Nathaniel is very sexually motivated.

When he meets someone who intrigues him sexually, he wastes no time in asking them to sleep with him. He tends to oxytocin-bond quickly, falling for anyone who gets him off enough. He really wants to bang Xander, but he's slowly begun to accept that he isn't Xander's type.

REBECCA. She chose to sleep with him as part of a deal, even though she asked him to call off his end of it when she was made aware of the consequences. He fell madly in love with her later. In canon, their relationship initially didn't work out, but in fic, they got back together when Trent asked to add him to Trent and Rebecca's relationship.

GEORGE. George blew Nathaniel to convince Nathaniel not to fire him, then they started regularly hooking up. Nathaniel basically made George his personal assistant, and they eventually got together after a mutual acquaintance clued Nathaniel in to George's obvious feelings for him. He introduced George to several of his kinks and George took to them like a fish to water.

TRENT. Nathaniel's first sexual encounter with Trent came when Trent beat him up and then molested him in the hospital, but even before that, he was attracted to the other man's muscular physique. They had a "forbidden lust" dynamic initially that made Nathaniel intensely curious about and hot for Trent, to the point of falling off a horse when he smelled something that reminded him of Trent's cologne. They have amazing sexual chemistry and move almost totally in harmony together.

SEBASTIAN. In side stories, Nathaniel has hooked up with Sebastian both out of curiosity/jealousy regarding Trent's other boyfriend, and because Sebastian and Nathaniel are both hardcore masochists who aren't afraid to hurt each other in bed. They've grown emotionally closer as well.

LUCIFER. Nathaniel has been in threesomes involving Lucifer, and unlike Trent, has no problem sleeping with the handsome devil.

FREYA (Side chat - Bex). He's gotten tied up and fucked in front of Freya before, which she seemed to enjoy watching, and he's also gone down on her, which they both enjoyed. He was under Lucifer's influence as his Incubus at the time, but would have no trouble doing such a thing again.

YOUR CHARACTER. Nathaniel will need to develop an interest in your character beyond just "s/he is hot". He does have a slight thing for hate sex, so the enemies with benefits dynamic works for him.