It would be nice if this was pinned, even if there wouldn't be a lot of people using it, as evidenced by the fact that this is probably the first thread of "I don't remember the name of the manga".
So, here's the one I don't recall the name of:
A girl gets confessed to by another girl, the MC deliberates on whether or not to accept because the girl said something about "A boy lives inside of me". The MC also has a transgender parent (father who acts also as the mother)
That's all I recall.