[She admitted once that she preferred the bad boys and Spike was no exception to that rule. What was wrong with a little harmless fun? Rose had no life back home, having been infected with a painful affliction after being bitten by a werewolf. She died permanently.
So while she was deemed to be imprisoned forever, there should be no reason why Rose should't enjoy herself and indulge in life's pleasures. She liked him, even if they would differ in terms of their feeding habits.
They may not be able to breathe nor feel warm but the passion was there, the hunger to seek some kind of solace with each other. She groans into the kiss, choosing that moment to pause her movements until she has his button undone and the zipper pulled down. Once Rose accomplishes that, she slips her hand into his pants to get a proper feel.]