There could be a knowledge gap. If the sex story involves some concepts or experiences that he is not familiar with, like certain sexual health research findings or new trends in sexual relationships, he will find it hard to keep up. Also, his mental state at that time, such as being tired or stressed, can affect his ability to follow her story.
It could be that he is not as interested in the topic as she is. When someone is not fully engaged, it's easier to fall behind in following a story. Or, he might have a different communication style. If he is more used to a slow and methodical way of sharing information and she is the opposite, it can lead to him not being able to keep up.
He may be distracted by other things.
It could mean that her story is very complex or fast - paced, and he has trouble following the details.
If you find it difficult to keep up with someone's story, whether it's about sex or any other topic, you could politely ask her to slow down. For example, say 'Could you please slow down a bit? I'm having a hard time following your story.'
Yes, it can be normal. If she's a very fast talker or if the story is complex, it's common to have trouble keeping up. Don't worry too much about it.
Without more context, it's impossible to say exactly who 'he' is. It could be a character in a specific story, or it could be someone in a real - life situation that is being talked about in general terms.
Another option is to focus more intently. Try to eliminate distractions around you, like turning off the TV or putting your phone away. Maybe take some notes as she talks to help you keep track of the key points in the story.
Try to relate the story to something you already know. If it's an adventure story, think about other adventure stories you've read or heard. This can give you a framework to better understand the new story. For example, if she's talking about a journey through a jungle, think about how other jungle adventures in movies or books were structured. It might make it easier to follow her account.
It could mean that in stories related to bedroom activities (which could imply things like cleaning the bedroom or getting ready in the morning in a non - sexual way), he is not able to stay on top of things. For example, if the 'bedroom stories' are about keeping the bedroom tidy, he might be too lazy or unorganized to keep up with the tasks like making the bed or putting away clothes.
Maybe he was really interested in it and wanted to know how it ended.
Maybe they lack discipline. They might get carried away with their flow and improvisation, forgetting the original story they intended to tell.
Perhaps she holds a symbolic meaning or is tied to some unresolved mystery. Her character might have a complexity that keeps the reader engaged and unwilling to part ways with her in the manga.