Oh dear, I’m afraid I’m probably not the best person to ask about this. I haven’t written a lot of smut, and what I have written has mostly been improvised. I wouldn’t say I ever really had much practice per se. I learned a lot from other smut writers, and that’s probably where I got most of inspiration from.
I can strongly recommend @megalotrash @sesurescue @agraulisvanillae and @askellie as proficient smut writers (there are actually hundreds I could recommend but these are the few that came to mind). They all have fairly different styles as well, if you’re looking for variety. (The last two definitely contain some pretty intense angst though, so be careful there).
I hope this helps! I’m sorry, I’m not quite the most adept at writing smut.