https://www.dlsite.com/maniax/work/=/product_id/RJ01571327.html

- Part 1 and 2 not yet uploaded.
- Before anyone gets tripped up by the title, no, this is not gender bending, "become a woman" here simply means maturing through having sex, Haru-chan (ponytail) lost her virginity back in Part 1 with her childhood friend Ryu, the male lead here, after Haru saw him and Kana do it, they become this polyamorous unit since, culminating in this Part 3 where both girls get pregnant, so they decide to become a family.

Base +22

"become a woman" clearly meant sex years ago, before gender mania took off in the past decade

it's sad that needs to be specified these days

Base +7