Just put that request out of your mind. Oni doesn't like changing his art, nor does he like making a ton of extra work for himself. He's said before he doesn't want to do something like that because he would have to add it to all poses and situations and he doesn't want to. The game doesn't have an end so it doesn't need a 'signifier that you've "finished" the content.'I'm not demanding that it be added this moment - or at the cost of other features. Reread my post carefully - once oni is finished milking this game and the spaghetti code becomes too unworkable for him, I'd prefer to see the final few updates to include pregnancy - because pregnancy is the perfect signifier that you've "finished" a girl's content, or in a harem game, having all the girls pregnant is usually the sign that you've completed the game.
This actually dovetails into why people asking for "full saves" also get mocking answers in this thread. The intended player's perspective is that there is no finishing or completing this game. There is only experiencing it. I've restarted and enjoyed playing this game dozens of times. Starting off fresh with the girls is actually the best part. You get to role-play how you corrupt the girls, and there are a lot of ways to do it.
If you want to imagine you've gotten the girls pregnant, just role-play it in your head and then have Xavier send the girl away to the countryside so that she can have the baby in peace. Issue solved!