User blog comment:TheMangaGoddess/Why Does Snow Love Bigby?/@comment-202.156.181.160-20161129045126

It's just fate. You'll understand it when you read the chapters at the end. If you see a woman with a green face, then you'll know that something about Bigby's fate is coming. Also, they're just romantically attracted to each other, and I don't think it's something that you can just explain.