I saw this while parusing through a few threads and saw this in the Transgender thread posted by
Luke2013. While this is a mostly TG related hentai OVA, there is one bit of AP process for the young ghost girl in the second story (she also grows a penis but that's after the AP.) There's not a huge amount of process but she has distinct breast expansion and you can see her hips grew after the BE.
Happens at 13:42
http://hentaigasm.com/residence-1-raw/