All Human fic set in 1950s (not milkshakes and motorcycles)

where Spike is attracted to Buffy and they start secretly dating because she's ashamed of him. They go "parking" and to the drive in a couple of times. At the end it turns out Spike is part of the English royalty. I think I first found it on an LJ account.

I think it's
Boys Like Him by BTVSLOVER82

Summary: Set in the 1950s. Buffy is a good girl. Spike is a very bad boy. She's not supposed to like boys like him. this was written for my friend vamptastica's birthday and is much lighter fare than my other spuffy fic. completed one-shot posted in two parts