You were nibbling Megatrons arm, Megatron was just sitting there, taking it, not flinching, he did groan a little, no cries or whimpers, just groans and silence, he then looked at you, he didn't care if you did this, it was your natural instincts as a Predacon to do, it wasn't your fault, and Megatron knew that, he was your caretaker after all