I LOVED that ending!
Spoilers ahead
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Twlya is so smart I swear. Even though she is a killer, at least she may have the right reasons. Would not be surprised if this was like an old race rivalry thing between the heart-less and the heart-break-eaters. That ending though, I think Vanilla fell in love right there. Her dad watching over her was an interesting thing but not surprising. I loved making all those friends. But I did feel really bad for all the friend's hearts she wanted to break. At least everyone else got their happy ending!
p.s I hope Mary and Reginald get married. And Vasilis and Crowven. Their all very cute together!