Ahh yes, wrong sub. Sorry. But they might work just as well on this one, worth a try perhaps...:)
As for the feet, I couldn't quite see if he was able to move his legs sideways just enough to get them out from under him and escape the tickling but if he can't then untied would certainly be a good option. The mic on the electro gives him power over his pain, does he yell/laugh/stifle it or does he get zapped? It's so horny watching a boy try and make those decisions, and fail!