[The moment she tells him it's okay, he starts to unplug all the tiny nerve connectors and loosen the screws. It would feel very odd, like he was separating each strand of muscle fibre but without any pain. The only time there is any pain is when he pulls the arm from the socket, thanks to the way the skin had tried to heal over it. But he knows that, so he gives her sufficient warning before he does it.]

This is gonna sting. [And with a sharp pull and a hideous sound of ripping, he pulls the robotic arm clear off, putting it to one side before checking over the damage left around the socket. Thankfully it's not too bad--just like puling a bandaid off a fresh scab, but he's going to clean out the joint and get it looking a lot healither before he even thinks about putting the arm back on. As he sets to work, he blinks as she talks.]

--You have a sister? Can't your parents help out? [he starts scrubbing the area with antiseptic, dying her skin a bright orange.] And don't worry about it. I did say it was free, remember?