Here's another game I forgot about: Adventure High. It's still being updated and if you pick a female protag it has almost nothing but les content(the non-les is all avoidable). And it's a pretty extensive game too.
There's also Spiral Clicker, the lesbian protag is a bit superficial but it does show lesbian sex with strapons.
Finally, there's Mind Conquest, however I'm not sure it counts because the MC is a woman possessed by a spirit of a male(?) necromancer and her mind has to share control over her body. Only les content though, visually.
All three are here
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It seems that some of the last comments here are from people who strive to see if they can put a non-lesbian game on the list, just to say: "look ... we make fun of their list and put on a non-lesbian game"
is it some kind of challenge?
If you're also referring to me suggesting Kobold Adventure, I assure you, nothing could be further from my mind. I suggested it because the lesbian run postulated by the OP is completely possible and the les content that is there is really good.