I've only seen bits and pieces of Buffy, and what I saw didn't really impress me. Maybe I saw bad episodes, or maybe it's just not my thing. I don't know. I do know that I've been very surprised by how far-reaching Buffy fandom is, reaching far beyond the groups of people that I would usually predict it in.
But I loved Firefly. Entirely in hindsight I'm afraid, I never watched an episode until a couple years after it was cancelled, but then watched the episodes almost all back to back on DVD. Love it!
Anyway, this was not a bad story. I would've preferred it to get to the fantasy part a little earlier. As it is, the beginning is mostly the woman bemoaning her dating problems and her arm flab. Note that I'm not complaining about the protagonist's problems, nor her bemoaning, as character traits, but they are not a particularly driving central conflict for me. Once the fantasy elements happened, it was much easier to get into it.
The idea was an intriguing one and I thought it was reasonably well executed. The reader did an excellent job portraying the character which enhanced the story significantly. The central idea was original (at least to me, since I haven't seen the related Buffy episodes) and well-written. It's a fun premise that makes me wonder what else could've been transformed, which to me is added value to the story.
For what it's worth, I didn't sense a coercion of love in this story, but perhaps I've just forgotten, I listened to this one quite a while back. In any case, I don't see a problem with it as presented, since her intent was not to coerce his love. And to address whether or not SHE should've been more attracted to him AFTER, I got the impression that she kind of liked him before, but as a defense mechanism she put up her full smartass-shield to blow him off because she assumed he wasn't interested in her. Once he became interested in her, she didn't need the shield and could let herself feel what she felt. Just a thought.
I also did like the non-traditional elements, like the fact that the spell was irreversible, and the non-entity boyfriend who was neither inherently good nor bad but just kind of a barely seen character that is of little interest even to our protagonist.