Just leave them be for a couple of days then try again!
I began cracking my toes a while ago, but one day, the toes on my left foot began to hurt when I tried to crack them... Whoops! I'm somewhat concerned now, 'cause I can't stop trying to crack them despite the discomfort! (it irks me not to do it) What happened?
Love your pic! Shion is adorable ^^ but anyways.. About your question, it doesn't sound too good >.> Mostly because I can't see doing that myself xD.. It might be because of how many times you have done so? :o