He just assumed that J-S was playing around with his joke. The Veil was strong and had instilled disbelief strongly in Chad, so the truth was presented to him as if it were jest. He smirked as lined up the needle through the hole in one side of the forceps.
"Don't worry, it's San Francisco. I'm pretty sure a vampire wouldn't be the weirdest thing you could see here, so no one will chase you out."
He adjusted the forceps a little, making sure he had the nipple just right in their grip. His tongue came out a little in an expression of concentration, a habit he had carried over from childhood and couldn't seem to kick. "I'd love to show you."
He smiled, making eye contact with J-S for a brief moment, and then looked back at the nipple. "Okay...one...two...three."
And he pushed the piercing needle through, forcing the sharp end through the skin clamped between the forceps. He held them with a firm grip, prepared for J-S to flinch or make some noise of discomfort, but he continued to push the needle through until the end reached the hole in the other forceps.
Just when that had been accomplished, he removed the forceps but left the needle in. He grabbed the ring and aligned the part that was going into the new hole to the end of the piercing needle. Chad had been doing this for some time now, so he was pretty good at it. As he pulled the rest of the needle through, he followed it with the ring until it was in. Once it was, he grabbed a cleaning swab to wipe away any blood and other bits that came out with the needle and then got on the ring.