The blindfold is necessary so the eyes don’t prejudice the sensation.
The ball gag is necessary to avoid waking the baby.
Hopefully they gagged the cuckold as well as witnessing such play can easily have him spurting spontaneously.
Tip: The temperature of hot wax can be adjusted by two main factors:
avoiding colored candles as they burn hotter
dropping the wax from a higher level, allowing it to cool on the way
When sensation play is done properly and the pet is properly aroused and blindfolded, her nervous system won’t know the difference at first between the hot wax or a cold ice cube!