This is great and I hope it gets more content (oral, more characters, etc) in future. In the meantime I've found a few bugs:
1. As others have mentioned, time wraps back to midnight at noon or 1:00 pm.
2. Cum appears in Mitsuki's womb even if you use a condom.
3. Both Mitsuki and Ms Average get pregnant on the same game day every playthrough regardless of whether or not they've had sex.
4. Only Mitsuki ever tells the player she's pregnant. The rest just switch to the pregnant sprite without commenting on it.
Did I mention this game is great? Please keep working on it!