Sketchtember 12: more FGO shenanigans with a side of stuff requiring some context from my Mastersona AU.
TLDR, Mastersona!Usagi and co managed to rescue some Yaga - mainly surviving rebels and kiddos - from the Russian Lostbelt - after which the Yaga settle in a post-True Pacifist Undertale timeline, integrating with the monster population there. (Toriel adopts a good number of the orphaned kiddos)