Mastique when not ruling the demon realm, tends to torture the mortals and low-level demons down in the castle's dungeon. In some particular cases, she gets requests from mortals outside the realm to torture them with her thick thighs and body. She finds it odd but whatever it takes to fulfill her demonic urge to torture and push these weak mortals to the breaking point.
If only they don't enjoy it so damn much...
Art, Creator of Mastique and Ranko - @rbcomics
The poor ---(lucky)--- sap - @jamearts