So...."Untie You" isn't what you're looking for, eh? LOL!
Obviously, you need more rope around your breasts. I tie them tightly with ropes that go around your torso, over your arms, and directly over the middle of your breasts. The ropes dig deeply into your flesh.
I take out the ball gag and replace it with an inflatable one. The ball gag is nice, but it's TOO nice. I keep pumping and pumping until your jaw is nearly distended. You can barely squeak now.
The tree will come in handy. Even with all of this going on, I can maneuver you so that you are on your knees and your tummy is against the rough tree bark. I then wrap ropes around you and bind you tightly to the tree.
Then I alternate between tickling your bare feet and swatting them with a switch that I fashioned from a branch of that tree.
You're a mix of in ecstasy from the vibes, laughing from the tickling and moaning in pain as the switch lands on the soles of your feet.