He didn't find it vulgar, no; if anything he found it incredibly arousing when she reached down and guided his thumb to press against her clit, in part because there was only one way she knew about that particular spot and how to find it so quickly.

Gently, he pressed the pad of his thumb against her, rolling it in a slow but present circle, while at the same time his index finger pushed deep into her at a slow pace. "You like that," he spoke warmly, kissing across her cheek, letting his mouth hover near her ear as he asked in a low tone. "Did you touch yourself— thinking about me?"