Macrame cuff
Usually square knots should be avoided when doing bondage. You are tying around flesh and blood, not around logs and tent stakes. But if you take care to keep the tension off of the knot itself, you can make a somewhat adequate cuff using it.
Coil the rope around the limbs you want to bind.
On one side of the coils, make sure there is enough of the working end for later. At the other side of the coils, fold the rope back on itself making a bunny ear.
Pass the bunny ear between the limbs and under all the coils. Notice where the bunny ear original dipped down making parallel lines. You will be coming back to that spot in a moment.
Now weave a square knot. Start by passing the end through the bunny ear.
Remember that spot where the bunny ear dipped down? Pass the end under and behind those two lines.
Pass the end back through the bunny ear. You will now have tied a square knot but with the coils ‘inside’.
To tighten, grab the square knot at each side and pull outwards. This will cinch up the coils.
Pull on the end. Notice that the force is not put on the square knot directly, but rather passes through it and puts its pressure on the coils instead. This prevents the square knot from capsizing the way it does when tying a fishermans loop.