*wanders by across the friendsfriendlists, hoping that's okay*

For what it's worth, I'd tend to go for a label like "gen with reference to x/y", or "mostly gen apart from reference to x/y".

Right now, there seems to be a lot of fuzziness in how categories get interpreted, and there are people who feel that a story marked as "gen" should have no reference to relationships at all and people who feel that something that's marked as "het" or "ship" (or "slash") should be focused on the relationship.

So I go for a bit of extra detail as a way of avoiding the hassle.