She had a good idea of what was intended by the painting's suggestion, regardless of whether anything would come of it, but the phrasing had felt like a personal dig. Which is why the young woman focused more about the head that was between her lips, stroking along the shaft with a couple of fingers to purposefully let the nails of her ring and pinky fingers trail along the skin.

The harder that Peter got, the further she took him into her mouth on each pass in and out, taking a moment every now and then to pull her mouth completely off and lick specifically at the very tip of the head. Most of the work was done with her tongue, the tip pressed and trailing more along the skin as she bobbed in and out, but happy to fully envelop him in the warm heat of her mouth when in as far as she was going. Which was going to go easily to the very base, having no actual gag reflex to stop her from acting like she was trying to swallow him whole... Though pointedly making sure no teeth scraped along him.

It wasn't all that she was doing, with a hand rubbing along Peter's thigh and hip, as an encouragement for whatever movements or responses he may have wanted to go with. Which, as she was keeping a steady pace instead of speeding up, there may be a few.