I think that Sirius got a kick out of girls having crushes on him. I mean, sure he must've had a crush or two but, hello, Sirius is serious! Sirius is good-lookin', that's for sure. Maybe, he had a little charm for the ladies. Umm ... but I don't think he'd be serious with anyone ( Unless it's me!

). But, you never really know.
Sirius Is My Man! (<- I really wanted to say that!)