[ It's probably not a great un-life decision, kissing her like this when he's already involved with someone else but although Spike was never one to stray, he also has a horrible track record with bad un-life decisions. It's just a kiss, right? It's not like he can deny that he's attracted to her, but they both have their sights set on someone else and so a forced kiss is all they can have.
It's okay, really. Even as he deepens it further. Even as he steps in closer to press against her. ]