In this position with the lubricant, I would work your butt with two fingers bent down, to massage your prostate. And since your ass is so powerful, I wouldn't let you go until you cum at least three times, and after that I would really play with you.
Oh baby.... This is mindblowing !!! Your tight body... your sexy lingerie... the way you spread your hungry boypussy is so feminine.... so erotic.... so inviting !!! I wish I was there... I'd eat your asspussy making it sloppy wet and ready for my hard daddy's cock..... Hummmm....