27) sender has had to wear a gag or muzzle as punishment for disobedience, receiver finally decides to let them out of it and test their submission. // let's partyyy
The training is for his own good. Etiquette is important when infiltrating other planets in disguise and, even when he tries to play nice, he slips up. Maybe that's her fault for picking their disguises the way she did; Empress of some bullshit planet she invented off the top of her head and Empress's pet who is not to speak out of turn.
They made it a few hours before she resorted to the ballgag, and he's still getting a chunk of the money they stole from the underwater palace owed by the planet's royal family. Sure, their currency doesn't exactly spend well on Earth, but it's gold. It can be melted down. It's not like she hasn't treated him nicely outside of the whole physical silencing thing.
When they return to her TARDIS, still appearing more like the interior of a spaceship than the cozy renovation later regenerations favor, she knows she's going to get an earful about all of this. So, before releasing him, she pushes him onto a black leather sofa, seated and patient. At least, he seems patient when he's still unable to speak.
Layers of her Empress disguise are peeled off, deep purple velvets and laces, lingerie remaining underneath. He listens better like this. She straddles his lap, her bare thighs grazing his own, visible due to the very short shorts she's put him in for his pet act. Face is brought in close to his throat, biting a hickey into it as the buckle at the back of his head is released. Gag is removed, cast aside on the sofa.
"Think you can be a good pet next time?"