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Trend very carefully if you're only talking about characters. The person behind the mask is likely quite different, thus the character you're "falling in love with" does not actually exist. If these feelings have propped up due to OOC interactions, well, then you have another scenario entirely. One I also advise you trend carefully, lest you end up hurt.
Becoming close friends, where you enjoy talking with that person daily needn't be more than that.
Becoming close friends, where you enjoy talking with that person daily needn't be more than that.