Technically you already rolled and had a result to know that they steal a humanoid woman's eggs by placing a sphere at the back of a woman's vaginal passage. When the girl or gas ms from the effects of their slime they take the eggs that come to be fertilized. Then the tentacle extracts the slime cell into itself to go off and give birth to a new ooze. If you have a perception check result of 15 or higher you spot a tiny pink slime running off with several crystallized eggs inside it.