Some tips of mine:
* Always change the font when you are re-reading what you wrote. Otherwise, you brain might just read over the mistake.
* For writing erotica, check out this guide:
https://archiveofourown.org/works/955716. I take it as gospel.
* Read a lot! If you want to write a scene about CBT, read works with it, see how people are describing it (and possibly, try to experience it yourself).
* Don't ever throw anything out. Instead of backspacing a paragraph that you, after typing it, decided you don't need, copy and paste it to a separe document. It might be useful later.