If it's actually Sano trying to steal MC's girls and is found out to be a lesbian, that would literally be shooting your own foot with a gun. It would insta-kill this manga for a lot of people since it would most likely devolve into netorare, and that too yuri ntr which is definitely not liked if a MC is involved.
But then again, this author has Yuri works, although their yuri mangas have no male lead so I'm still not sure where this will go.
I guess the direction would be pretty clear in a few chapters.
Also, people seem to forget that the title is from the Female Leads' perspective, not the MMC's.