Sex help pretty please💕

Hey ladies, I need help. My boyfriend and I have been together for a year and a half and we have been sexually active since we have been 17. We usually do sex the same way with a routine but we don't mean to do it the same way every time it just goes that way. Well today we were having sex and I ended sex the way I always end it. I was riding him and I noticed it felt like he was slipping out but he wasn't completely soft. I asked him what happened and he said that he just wants to mix it up a little. Not do the same thing every time. I agree because I felt the same way but I just did things th same way because I thought that's what he liked. So my question is how and what can I do to switch things up a little. Sexy things I could do and things I can do in bed to turn him on that's new. Please help me and give me advice.