These comics were from the end of the second part of a three-part series, "The Goblin's Despair" (Zetsubou no goblin). Part 1 is here:
絶望のゴブリン
There's a lot of text, but basically goblins who were caught raiding a forest village get captured and tortured, and the girls realize the goblins are seriously masochistic.
This series is seriously way more brutal than her usual stuff, just FYI.
You're welcome! Check out the whole series if you haven't, and the rest of her awesome art.
Hisano-sama's Pixiv archive is here (requires free registration) :
https://www.pixiv.net/en/users/17422240/artworks