You'll adjust to those bindings in time i promise you. they might seem painfully tight now but believe me, once you start your orgasm therapy, they're going to limit your squirming quite nicely and silence your dirty moaning.
Chopsticks task - Use two sets of chopsticks or something similar on each nipple like in the picture above. For added pain, tie the end of the chopsticks to something static and stable in front of you and pull back, stretching your nipples.