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Seriously, they implied that? Ugh...that bothers me. Not really a big fan of characters that age getting it on. When they revealed their ages at the end, my opinion of their relationship REALLY took a nosedive.
And that's not to say that I'm against characters with relationships that young, I watched Kodocha for god's sake, but I guess it's because they tried to make those two and their relationship unrealistically mature (as well as the characters' designs). Not to mention that (in the anime), their relationship develops too fast. But eh...