I apologize in advance, I don't know English very well.
1.I suggest adding character customization, that is, increasing or decreasing breast size, customizing appearance, or adjusting pussy.
2.You can add a pregnancy system, that is, carry insect eggs in the pussy or in the uterus, and over time, when they hatch, at any moment they can begin to crawl out
3.You can also add that if the uterus and vagina are completely filled, then eggs will begin to be laid in the urethra.
4.add visibility to what is happening in the uterus and urethra
5.You can also add new enemies like earthworms, bedbugs, cockroaches, or caterpillars. For example, worms and bedbugs will crawl into either the uterus or the urethra and the caterpillars will lay eggs either in the urethra or in the uterus
Once again, I apologize if something is unclear because I don't know English very well.
But if a system with a urethra really appears, it will be very cool.