for the actual question... English is my fourth language, and while it's been 30 years since I learned to write correct english, very early I found it's just not enough. the real problems are NOT grammatical but related to storytelling. and storytelling is the same in all languages, it speaks in the language of emotions, anticipation, foreshadowing, revelations and journeys. not grammar, not semantics, not in ortography of any kind.
so I just write, try to not make mistakes, but also try not to get stuck in the text. there will be mistakes but they're rarely important. get the story out.
except if you're writing a character whose VOICE is fundamentally based on speaking correctly. like a teacher, she MUST speak correctly. and if you can't do it just avoid such characters. a stupid teenager can speak as incoherently as you like, we've all seen how people often can't write an understandable sentence even if their life depends on it.
so choose your characters wisely and you're already there. plan well.
Wow, I'm new here, so I couldn't even think that some people will write such amounts of text about writing on a hentai forum. I seem to have the wrong impression and there is a much broader diversion of people here than I thought.
And, you know, your "just write" really got me thinking. Because I think my main problem is that I just tend to, like you said, "stuck" in the text. It's not a translation problem, but a writing one. And with all my little experience in several developing areas, I can say that they are all quite the same. I mean, drawing, writing, programming, etc., they are all different on the surface, but they work the same way because our brain is processing all of these spheres in the core.
I can just transfer my drawing experience to writing texts. For example, when I finish some lineart, I never start to colour it right away, just because I got so caught up in all the details and stuff, that I can't see the bigger picture, sometimes I get really "stuck" with it.
But if you leave all your sketches or lines as it is and just go to sleep, the next day with a fresh head you can look at all your art, close your eyes, take a deep breath and say "What the f is this? Why is this head bigger than the torso, why are these knees bending in opposite direction, it doesn't look human at all, neither an animal, now I definitely will have nightmares for a few months".
So if we assume that text is a sketch, then I'll just do it my artist way: just write a lot, write fast, maybe even write different variations of the same sentence, try something new and of course, sleep. And what's important, I think it will be better if I will write in Russian (my mother tongue in case I didn't mention it before). Just because I'm mixing language learning with writing, and again, with my artist experience, mixing different tasks is a way to punish your brain, not a way to progress faster. So I can float through my language and focus entirely on the narrative without being interrupted by not being able to translate something. And if someday I'll want to improve my translation, I will already have all the dialogues written at my best and all I need is just a good translator (and so is the writer).
I don't know if it's a good reply, this was written more for me to put it all in my head. But as for reply, I just want to thank you. You and the other guys above. Sometimes we are really just stuck with something.