Pregnancy only happens in the 100+ brothel count ending.
What makes me super weird is that I notice this game has unused cg in the data... It's kabeshiri content (wall butt) and it has something to do with the MC being trained. This makes me so curious and so upset as to why the author didn't bother to implement it.
EDIT: Diving deeper into the codes, there was also some extreme contents like fisting and prolapse I guess. Both of these aren't implemented in the end, and both of these events could be shown if you have MTool or something to run it. It even has corresponding CGs for it, although not complete. Huge disappointment.