Can't seem to talk to my BF 😂

How do I get a little extra flirty with my BF but like still let him think you not a freak of any way lol I just want to be a little sexy on the phone but not like really sexual just innocent kinda I just don't know how to start up the convo like that because I'm not the really sexual type and he knows that but I feel like I'm ready for a little flirty talk not too much  😬😭