I brought this up with the team and Fenoxo mentioned needing to be careful with balancing lust items. I'm not sure if it's up for review right away, but it has been noticed.
This should hopefully be implemented for the next release. You'll have to replace/remove and regain the tail if you already have it, but it should now add a bothrioc-shaped tail cock to the tail. The item itself probably predated when tail cocks were properly flagged and genitalized, so it only existed as a tail ovipositor (and as far as I'm aware, ovipositor content is already very slim).
Unfortunately, this is the nature of an in-development game. Sometimes things get overlooked and I add them in, if I'm able to, when I see the notes (had I not reviewed those events myself, I would have not run into them). There are probably other instances of this throughout the game, but hopefully nothing game breaking.
When I do encounter such instances, I do try to make an in-game way to obtain it, only if it fits (such as the savicite idol). But for Kiro's dress, it is kind of impossible in that the item is only found in that particular dungeon (Illustria Po's ship), and that dungeon, Kiro, or Kiro's ship can all go away after the quest is completed, so there really isn't a nice place to put the item for pickup if you've already done the quest.
I did float the idea of making a kind of "reclamation box" on Tavros that can contain such missed items (assuming the conditions are right for you to claim them), but Fenoxo wasn't a fan of it (and to a degree, I do agree that it would just be a bloated feature in the end). Maybe it'll be considered if there are too many items that suffer that curse. But for now, feel free to cheat in the items if you really want them (you can also cheat in the flag conditions if you go the extra mile and use the console and know what flag to change), or start a new run when the game is completed if you desire the full collector's experience. Apologies for the inconvenience.
