Peter was actually laughing at her attempt to dry herself off, and her reaction to the trickery he provided, when she suddenly pulled him towards her for a kiss. It was entirely unexpected, if he were honest; sure, they flirted, they always did that. They had fun, he made his innuendos and comments, but if he were to be entirely honest, it would be that he just didn't expect her to be into it. If anything, he assumed she had something on the side, that he was there as a slave for... whatever it was his purpose was. Nothing really more.
Still, when she pulled him in, Peter was actually quite content with it and didn't seem to mind even the slightest. Instead, after his initial surprise slid away from him, he placed one hand to her waist, curling around to the small of her back and pulled her even that much closer; while his other hand clung to the back of her wet hair, pulling her lips in tighter against his, kissing her back, wanton in that kiss, as he breathed her in and pushed up against her hungrily. She was hot, gorgeous even, and he wouldn't lie that he'd thought about this quite a bit since being bought by the woman.
Tongue snaked its way past her lips, fighting against her own tongue as fingers kneaded into the back of her head, the other hand slipping down to course over the soft meat of her ass, fingers clinging a bit as he kept her held to him, letting her hands wander as he did so.