Thank you @ramenbagel for giving me an idea
Leon sat on Shiro’s lap, his legs straddling their hips, elbows on their chest while he tugged one of their earlobes with one hand, and held a sewing neddle in the other. “Stop squirming!” “Soorry!!” They kept pulling away from Leon, which was not helpful when he was trying to put a needle through their ear. They still had the ice cube on the back of their earlobe, like Leon had told them, but it was melting quickly. He directed them to rub it over the front of the lobe first, then he jabbed the needle in. Shiro let out a scream, more because they were scared no because of pain. After he took the needle out, Leon gave them a kiss. “Ow...my ear...” “You asked me to do that!” “I said yes to you saying if I wanted a peircing!” “Same different, you big baby.” They pouted, and stomped off to the bathroom to wash their ear. Leon chuckled and cleaned up his stuff. They were still all grumpy when he went in the bathroom to chuck the rest of the ice cube in the sink. “You’ll love it tommorrow.” “Yeah.” He pat them on the back, and they smiled.