What should I say ?

So every once in a while, my husband and I will be "in the mood" while he's at work and we will sext each other til he gets home and then have amazing sex. But he is always the one that starts it. But I'm in that type of mood and I want to start messaging him but I don't know what to say to get it going. half the time, he's just oblivious to what I try to say so I just give up and move on. any tips ladies ? what can I say that will get him going ?