There is nothing as erotic, as light me up in total excitment, as when I know a man is going to, and that wants to, fuck me.
He wants to do the most primal thing we inhabitants of this planet do, stick his cock into me and pound away until he reaches orgasm
Sometimes he lets me know by indicating he’s ready by  responding to  my desire for it. The subtle way I look to spread my legs  around him so that he is in the inner position.
Or how while I’m straddling him, but he is not yet inside me, his cock keeps slipping closer and closer to true penetration. It gets almost right there, and slips away. I sort of grin with a semi wicked look qsking/saying "Well?"
Or he push’s me against the wall, pinning me, letting me know he owns me sexually
Or he turns me around and push’s me face down and tells me to stick my ass up in the air

There are many ways this happens, it could be he heard me ask him” Please make me your bitch and fuck me”  but that moment is so exciting and fulfilling to me. God I love it