“Anonymous human with incredible stamina”
This is a reward for Changeling Scout class patron.
Base on true story(?) : https://www.fimfiction.net/story/420994/bugging-out
2 naughty versions can be found on Dark Side Of Hive Mind. You can check how to gain access to it from here.
https://www.patreon.com/posts/dark-side-of-14972794
Despite their obvious deficiencies compared to changelings, the queen shows her wisdom in recognising their potential utilities. One can only she doesn’t find this specimen wanting. It’s not advisable to displease a mare of her standing.