I don't comment often, but this is a a bit out of continuity and out of character for Allison.
for one it's kind of a major rule that you never leave a person alone and by themselves while in bondage gear, be it rope, metal handcuffs, leather restraints, any form of bondage. an Allison would know this better then any one. with the events that are mention in
Early-installment weirdness. Back when this was published, the series was knee-deep in fantasy with Lisa and Anne as basically real slaves being subjected to unsafe BDSM. It only later turned into a slice-of-life romance with realistic BDSM.