Adult PC Game: Boku no Futanari Kanojo! -Zetsurin Shoujo to Junjou Shounen- by Peaky Archive

Kazuya, the hero who fell in love with the kindness of the heroine Aoi.
Kazuya confesses to Aoi, but the reply is ambiguous.
The reason is that Aoi was her androgynous.

Aoi, who has come to the time when she has to decide her own gender, imposes her conditions on her Kazuya.
"Are you confident that you will love me even if I become a man?"

Kazuya replies without hesitation.
"I am confident that I can love my seniors, both male and female."

In this way, the two begin dating.

And a few months later ...
Aoi and Kazuya will do H for the first time,
There was a male genitalia in Aoi's crotch!
Kazuya was very excited to see it ...
And Aoi ejaculates with her first H!

From here, the true love between the two begins!