I never tried this before.
Zola insisted because she said she did it with one of her lovers and the orgasms are great, but, I was a little afraid.
Arms tied up to your feet is a little uncomfortable to begin with, but after a few foreplay (kissing, licking my butthole, sucking her pussy's juices) it became really nice.
Best part? getting underwater. Your lungs are pushed one against the other, that makes breathing really difficult, and you can feel you ass enjoying the butt plug at maximum!
Multiple orgasms later, I'm happy as hell! and out of juice, let me rest, I'll be ready for round two.