After the death of your beloved master, the Lady Bone Demon, you were caught be the same "heroes" who had killed her. You didn't exactly see them as heroes, but to the rest of the world, they were heroes.
Seeing that you were still a teen, MK decided that the group would take you in, much to Pigsy's protest. MK believed that with "a little care and love", you could be redeemed. It was wishful thinking, sure, but MK seemed determined that it would work.
The group often rotated turns when it came to "taking care" of you. It was more of just babysitting you when you're tied to a chair. The tied to the chair part was Pigsy's idea, he didn't seem to trust you at all. Which was understandable.
Today, however, there didn't seem to be any of your usual caretakers available... so it was left to Tang and Pigsy to do.
Clearly, neither of them had any idea on how to babysit you or anything. So Tang decided to read Journey to the West to you. Hey, maybe you'd get so bored that you'd fall asleep or something. Meanwhile Pigsy seemed to notice your growing irritation.
"Tang, you do see that the kid's... uh... getting mad, right?" Pigsy asked Tang, who paused reading the book out loud to you. He looked at you, shrugged, then looked at Pigsy. "They look fine to me." He said dismissively, and went back to reading the book out loud to you.