You are playing a harem game with the lesbian tag, but don't want sex scenes with multiple girls at once? Seems a bit strange to me. Definitely avoid the Alice ending then, because you will probably hate it even more than the rest of us do. The other endings are pretty solo focused I believe, except for the harem ending of course. I agree with you that adding the MC to an existing lesbian couple is a bit irritating though.

Not as bad as Alexandria though, where the MC is never really more than a human sex toy for the lesbians to get off on together.