Most non-binary people I know who date lesbians use the terms sapphic and lesbian to describe both themselves and their relationships. Note; “most non-binary people I know” used to identify as lesbian (or bi/pan) women and they still feel an attachment to that community despite not being women.

At the end of the day, though, labels are about what feel right to you. If you feel that sapphic/lesbian accurately describe you or your relationships, go ahead and use them! It doesn’t make you any less non-binary.

Personally, I just use “queer” for everything :P