It’s wild how many ways writers tackle the whole Renesmee and Jacob age gap. Some go full-on magical biology handwave – she’s physically mature by like, five or seven, so it’s not as creepy, they argue. Others lean into the weirdness, treating the imprinting bond as a preordanged, almost mystical thing that overrides normal human ethics. You'll find a lot of stories that just age her up immediately in the first chapter, or use time-skips so she's an adult when they get together.
But the most interesting ones, I think, are the ones that actually sit with the discomfort. They explore the power imbalance, the fact he knew her as a baby, and make the relationship a slow, conflicted burn. Those fics can feel a bit icky, but they’re also weirdly more honest about the source material's inherent strangeness. Honestly, most of the fandom seems to prefer ignoring the problem entirely and just writing fluffy, established-relationship stuff.
Sometimes I stumble on a fic that reframes it as a found-family thing that accidentally turns romantic over centuries, which at least gives them both some actual life experience. That’s probably the most palatable route, but it’s still a niche take.