I have the exact same problem at the moment. I slipped on the stairs over the weekend and fractured a bone in my foot and think I sprained my ankle too. I tend to flex and tense my feet when I orgasm so I'm too afraid to have sex at the moment because I'm too worried it'll hurt my foot. I'm dreading waking up in the middle of the night with a foot cramp!
Plus, I couldn't feel less sexy than I do right now, The boot thing is not sexy!
Maybe try having sex sitting on the kitchen counter or on a table. I'd be worried that in standard missionary he might bump off your ankle. Perhaps reverse cowgirl but with your legs out in front of you. That way you can adjust your foot as needed and your OH can bounce you.
Just make sure you keeps loads of cushions and blankets in the bed to keep your ankle propped up. And, yeah, let him do everything!