Wtf did they stuff in his ass?

What they did was equivalent to an enema, so it was either some water based solution or it could be done with just plain water itself

So like a douche????? Why douche him if he ain't getting dicked down????

Lol, right
But it is his first time, so the manager is probably getting him used to it. It could also be a part of a humiliation play, for the Knight

Ahhhhh, thanks for the anal sex lesson

Ahahahaha
No Problem