Riding Tips?

So my boyfriend broke his collarbone last week but that hasn't made our sex drive any less. He can't do a whole lot of movement so the only way for us to do it is if I ride him. I've done it before but it's never JUST been me riding him. Yesterday we tried that for the first time and he said it was alright but I know it definitely wasn't great. Any tips for making it better for both of us?