A Leaf, a Berry, and a Single Rose (for my love)

Hermione sends Ron on an epic quest to... find a few plants? That's a bit anticlimactic, isn't it? In any case, Ron didn't plan on it actually being a difficult journey full of emotional development, sacrifices, gardens-turn-mazes, and giant snakes (not in that order). Nor had he planned on falling in love with Hermione's research partner: Viktor Krum. A/B/O, fairytale/royalty AU.