I too often wish "love story" were a category... but it's not. 
It does sound like a romance though. I mean, given the one review you have on it, it sounds like they get their HEA, lol!
There's no one saying you MUST have a beefy/busty couple on the cover if it's a romance. I'm reading Attachments at the moment, which is an adorable quirky romance, and there are office chairs and a paperclip on the cover.

It sets a certain tone that's true to the novel.
You could put a couple on the cover, but if that's not true to your book, that would be false advertising, and people would rate badly when they didn't get what they expected.
It does sound like a romance though. I mean, given the one review you have on it, it sounds like they get their HEA, lol!
There's no one saying you MUST have a beefy/busty couple on the cover if it's a romance. I'm reading Attachments at the moment, which is an adorable quirky romance, and there are office chairs and a paperclip on the cover.

It sets a certain tone that's true to the novel.
You could put a couple on the cover, but if that's not true to your book, that would be false advertising, and people would rate badly when they didn't get what they expected.