A cool idea would be to have a girl absorb another girl into herself. It’s similar to the unbirthing effects done before, and can be pulled off with CGI. You can show the skin of the two ladies merging together, and maybe have a large shot of one pulling another into her stomach, and if you want you could maybe show the absorbed woman’s face sinking into the stomach, like you would see a woman’s face sinking into quicksand. Just a thought.