LDR & phone/FaceTime sex

My s/o is in the army and he is currently in Korea for the next year. We've been calling, texting, FaceTimeing, anything and everything whenever we get the chance. But something that keeps coming up is phone/FaceTime Sex. And I really want to be good at this, he just knows exactly what to say and do.  Does anyone have any advice, tips, stories? Or anything about pond distance relationships and how you made it through? It's a 14 hour time difference from where I live and where he is, which has proven to be difficult, when I'm waking up he's going to bed etc.  Anything would much appreciated, thanks ladies!