Sex advice!!! ASAP

My boyfriend and I want to try new positions or new things that make you feel good. I especially want to do something new to him. He loves it when I ride him but I get exhausted fast. A lot of girls say that they come off from riding. He’s tying my hands today as a new kink but I want to do more. I want to know what will make my boyfriend even more horny. I love it when he’s really into it and he has great endurance like he loves to do the work. I want us to do more than just missionary and doggystyle. Thanks!!!