Riley hadn't thought about what Rez could do, of course there were probably a ton of small jobs Rez could do if he wanted to, not that he needed to work, Riley and Rez both had plenty of money.
When Rez started joking about being a 'a housewife' and then climbed on top of him, making the submissive statement of waiting on him when he got home and combining it with the bite and the purr...it made Riley's body flash hot, his dick twitch and the slightest moan come out of him. He wasn't normally a very dominant guy but that image and the words coming out of his lover's mouth just did something for him.