Sweetheart, I've got you under my skin. I'll wash and wash, but you'll never come out.
I'm crazy for you! Get it?
Honey, I'm hot for you! It's like a fever. Do you think it's viral meningitis? I bet it is.
You and me, sitting in a tree—oh, wait, that doesn't sound very safe, does it?
It's hard to tell, what with all the SSRIs in my bloodstream, but I think I feel something for you.
I bet you guys could come up with some good OCD Valentines since you're all so witty.