Here is something each of you can do - and the one with the best time then "owns" the other for 2 hours of personal service.
The observing (cheerleading) partner will make sure the bindings are secure, and provide the spanks at the end.
Alternatively, the observer can do the video!
SOCKS
Gather 10 socks and scatter them throughout the house, on one floor only! Don't hide them this will be tricky enough! Just chuck them wherever, as long as they're on the floor. Put a basket somewhere on that same floor.
Now get naked and tie your ankles and knees together and tie your hands behind your back. You'll have to collect all the socks with your mouth and put them in the basket. You can only carry one sock at at time, so you'll have to make multiple trips! Note: only one sock allowed in your mouth at a time.
Use a timer to record how long it takes. The number of minutes it took you to collect the socks will be the number of spanks on each ass cheek with a serious implement (no light ruler, spatula, etc.). You will get those after you're finished and untied.