She's been self-sufficient for a very long time already, so no reason to expect it to stop any time soon, even though her sexual engagement with Paul tends to be merely HER pleasing HIM much of the time.
You'd surely know already that a woman can sustain an orgasm as long as he likes, providing the mental images in her head are still uppermost and she has not rubbed herself to soreness, which won't happen if she's continuously lubricating as I suspect she is.
Being on the verge is one thing, but the compulsion to bring it to a conclusion is quite another where a woman is concerned. Unless she's rushing off to an engagement is limited to a quickie, I'd back Leora to keep the momentum going for as long as possible, whenever she can and that's what we are privileged to see.
Paul, meanwhile, who can know what the shouting was about? It was probably some petty domestic issue like remembering to buy milk or dog food of something similarly mundane. It's not always going to be relating to anything sexual where they are concerned.
If a Russian-speaking member knows what was said, all the better, but what often happens is that we get a translation that is not always clear or is written in a subjective way, defending Paul or Leora, at times, rather than simply providing a word-for-word record of what was said.
That's something we have no control over. Translation is never easy. The local idioms and cultural assumptions sometimes go over our heads, or are misinterpreted by us along the way.