If you're still interested in how to obtain "girl cum": To obtain it, you must enslave a sentient creature with a vaginal opening. After that, you will need to upgrade the "Submissive" branch of the slave, allowing you to leave your ward with Eliza. You may need to upgrade the laboratory in the medical unit to achieve this. Have good game!
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Be careful when leaving your slaves in Eliza's care: in my experience, there have been two instances where a slave given to Miss Eliza has been mentally broken by the challenges they faced. At the very least, if your little pet is naive, I recommend saving the game before giving it to the "handy" mad scientist.