Don't mind me. Just going to save this list somewhere else. Also, I'm adding some games as well.
Sisterly Lust
You can impregnate a LOT. While some only show up on the ending "You are winner" page, there are play sections with your family and close friends while pregnant.
Hazumi and Pregnation
Play as a prostitute that gets impregnated by her clients, and give the child to the state (something something Japan declining birthrates). The belly/breasts/hips grow with the passing of time, and you can even give birth while having sex.
(edited links)