There is a failure here to make a distinction between the player and the player character, creating confusion.
Yes, your comment was unclear; no, it has nothing to do with the player/PC distinction.
A complaint about all interparty relationships going through "you" implies companions should be taking care of Ryn's needs without
any input from player or player character, like how Brint and Cait or Cait and Arona fuck on their own whenever without anybody telling them to. If the player/PC is the one who tells them to do a thing ("hey, yo, can you fuck Ryn because I can't be assed"), and then they keep doing it automatically, then that is an interparty relationship that goes through both the player and the player character. Hence the lack of clarity.
The point is that the player has to maneuver their character to the Frost Hound to pick a Cait/Arona option when that makes absolutely no sense in the game world and abuses the player's time.
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This is, again, confusing. There is literally no loss or gain of player input in the story in either the status quo or what I suggested should happen. Like, none. Player input, story-wise, remains identical. What changes is player clicking, in UI use, and in the emergent narrative of having to run the party back to the Hound as the result of that clicking.
Automating Ryn's interactions with the other party members means exactly what I said: they can take care of each other, because they'd want to do that in story and because the extra clicking serves no purpose (and Frost Hound-only is just bizarre, given that every other square of the game world is a love hotel).
I'm sorry that you're confused.
You seem to be stuck on this "Frost Hound" thing, which is, as I said, completely untrue. Camping supplies exist. Camp is one of the other valid sites for repeatable companion sex. And Ryn can even get relief in camp without the player fucking her, so long as Arona is in the party. Just ask Arona for a "threesome" and then "just watch". Boom. That said, this option really ought to exist for Cait as well, as should a valid threesome for Cait, Ryn, and a Champion without a penis. Perhaps somebody should write it.
Besides, if a nightly camp stop (which is all you need with low-Libido Ryn to prevent blue balls) is overly onerous to you, then I can't really take your complaint about the 'emergent narrative' of the game and 'vermisilatude [sic]' seriously. After all, for
verisimilitude, you should be sleeping every night anyway, and from there it's just a click or two to getting her relief, whether through Arona or Champ. Don't dress this up as a 'narrative' or 'story' problem. Just say you can't be assed to keep Ryn well-fucked and happy, and as such, don't want to take her around in your party. That's a perfectly valid feeling, but it's also one that places the burden on
you rather than some supposed structural problem with the game. Kind of like how the player doesn't get Kiyoko as a companion without making a babbu with her. If you don't want babbus, you don't get Kiyoko. Them's the breaks.
The blue balls are meant to be noticeable, but not incredibly taxing for the player/character to handle this - not significantly more taxing than it is for the player themselves to handle their own blue-balling. This is the whole point. You're supposed to
want to remove her cage. Allowing the player to automate Ryn's relief with a set-and-forget option, whether handled by the companions or by the player character themselves, would move it out of sight and out of mind, and reduce its relevance and immediacy for players who like Ryn enough to take her around in the party. If you don't like Ryn enough to do that, that's fine. Just give her a hug every so often and leave her in the Frost Hound. Maybe give her a razorcup every so often in case she's plot-relevant and necessary for combat like she is in the Palace of Ice.