Riding advice???

Courtney • • Life's a garden. Dig it.
So my boyfriend likes it when I ride him and I sometimes get the urge to take control too! But it seems like everything is going all good then I can't ever make him cum by riding. I've made him cum once by doing it. All of the other times he's tried to take control and just lean me towards his chest and bounce my ass up and down on his dick. That's fine and all, but I want to be able to make him cum by myself. I want him to be able to lay back, relax and just take it! One time he's even made comments about him having to finish it because I can't, which I get can suck for him but I really wanna be able to surprise him one day and show him that I can.... So, any tips and how to ride better and make my SO cum?