Wow. You put so much character building into your sex scene, and somehow, it just makes them hotter. Spike has always given his all. He's never had someone who gave their all for him, accepted him completely for who he was, loved him without trying to change him. At least, he didn't have these things before Xander.

And Xander's never had someone so focused on his needs and desires before Spike. It's really beautiful to watch.

Xander's greatest desire is to make Spike happy and Spike would turn himself inside out to be what Xander needs. What a completely perfect love scene.