He enthusiastically complied since that sound she made was so erotic yet cute at the same time if that was even possible. How could he not want to see what other noises she might make if he kept going for that approach. So he brushed his thumb again, then he pressed it down onto the nub, then rolled it around in a semicircle before following through with a light flick. Though his hand was doing work he was starting to wonder how she would react if he did it...in a different way.