How to deal with a particularly passive top

I recently ran into a strange(for me) situation. I hooked up with a guy in his mid 40’s. He was a very enthusiastic kisser and seemed to enjoy getting his dick sucked prior to him penetrating me. After his dick was in, he just stood there. I rocked and pushed back on him a few times, once almost knocking him over but he wouldn’t start thrusting. I like the guy and will talk with him about it, but how do I make it enjoyable for both of us if he is going to be that passive?