Dirty-ish talk?🤔🙊

So my boyfriend and I were on the phone with one another and we both got really "in the mood" as he put it and he wanted me to talk dirty to him but the problem is I can do alot but coming up with things to say just isn't easy for me. Does anyone know some good things to say? He always asks me to tell him what I'm doing to myself and what I want to do to him, but I don't know how to make it sound sexy. It just feels weird to say it. I also don't want to sound inexperienced to him either... I need some help from all the experienced ladies out there!!!!!