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To understand the relationship between the anime saving leaf and his uncle, you first have to understand the nature of r/banter and anime in general. Looking at a strictly canon perspective, there is no confirmed situation where the uncle and the anime saving leaf ever had sex, and certainly not through introduction by SSP as the OP image would imply. Canada being raped by his uncle is merely an inferred situation: a posibility not set in stone through the word of r/banter, yet neither ruled out as something that couldn't occur through some sort of contrived circumstance. This is likewise why certain works depict the uncle as an angry god demanding sacrifice, a benevolent figure from which to channel Canada's hopes and desires, or a simple creepy uncle to be molested by. Until deemed true or untrue, any of these outcomes could possibly occur in the hypotetical case that anime saving leaf and the uncle were to meet. It is something that is under no constraint, much like manx's presence on the board and ADE's sexual preference.
Oldfigs might scold you for shitposting and attempting to fabricate a situation they deem contrary to character - "le uncle touched my peepee" would imply a certain sense of altruism on the former's part that has yet to show up in canon, leading to the argument of thread derailment, but many good threads interpret the exact characterizations of rules differently from strict canon. After all, the canon spin off boards take artistic liberties in the depictions of individual rules, yet remain supported by /bant/ regardless if they depict uncleposting in the way he originally invisioned them.
Ultimately, the anime saving leaf and his uncle's relationship is dependent on the context of the work you are consuming. In one thread, they can be bitter foes, a damsdel in distress trying to outrun a blood-thirsty monster in vein. In another, happily married. To under stand this is to have a basic understanding of /bant/ as a board.