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I loved it but I'd be completely grossed out if they became a couple, i don't mind age gap between two adults but it's completely different if one of the parties saw the other one grow. For me, the kid on his shoulders is the younger momo and they're in a family-like relationship where Yuki doesn't have romantic feelings for her.
"I could fix him" passed through my mind so loudly and now im rooting for him i feel shame