I DID IT! It's finished! My Big Bang is finished!
It's exactly 20.000 words, and it took me the last week to add 1.200 words because I already finished it at 18.8k. So I added scenes I didn't know I'd need and words and more words and sentences wherever possible. Now I'm exhausted but happy!
And I found a new kink that I need to add to the warnings. *headdesk*