i meant 'alternate dimension" more as in how the "canon" in A6 plays out, not how players play their MC. so like, the canon universe in Damon's route (regardless of MC) acts as if he and Alisa are not a thing Pre-Cursa, but in other routes the canon plays out as if they already are—albeit loosely, intimately involved before they rekindle the feelings that are still there.
side romances don't bother me at all btw! i do love games where romanceable characters can be together, like with Dragon Age.