Sunny was born into a wealthy family, she could do whatever she wants and her parents were too busy in their business than bothering her on what she. She used to having selfbondage in her house to spice up her life but she was unsatisfied with it and decided to add some thrill in her life before graduating by performing a selfbondage in school, risking herself of being caught red handed by other. She spent some time to observe and found that the female locker room will be empty on the Friday night and the guard will never bother to check on the room. So she decided to have a some private little games in the locker on the coming Friday where her parents will be on a business trip for a week and will not have anytime to bother her.

She pulled out her recent bought armbinder leotard which was tailored one size smaller than her size. The suit was made of some material similar to lycra but was tougher but not so stretchable and she has struggle to put on the suit. An instead of lace for the attached armbinder that barely fits both her arms has a heavy duty zipper all the way up to the collar and it was pry resistance which meaning once it was zipped up, her hands would be useless with her elbows touching and both palms flatten and clammed together by the mitten, leaving not even a single gap for her to wiggle her fingers or arm. No way she could escape until the zip on the back was lowered down. The suit itself was not meant for selfbondage but with a zipperbot attached on the zipper, she can trapped herself in the devious suit perfectly without any effort needed. She have tested out once and the result was fantastic.

On the Friday Sunny only had some light meal on the morning and only minimal water was taken. She was exited on her plan and could not stay calm. After class dismiss, she empty her bladder and hid inside the locker room, waited to school be empty. After few hour, she could not hear any crowd anymore and she knew she could start her plan now. She went for her locker to and starts removing all her uniform. The clothes followed with her bra and panties were nicely folded and placed on the upper compartment along with her bag. She was nerves and embarrassed with her current state and swiftly put on the leotard. It was a struggle but she was happy once the smooth material nicely clad over her slander torso.

Leaving the armbinder dangling free and she place a pair of  leather cuffs over her ankles and lock it with small lock. A belt was went through the D-ring on the armbinder tips  with both end clipped on the D-rings on the cuff, preventing her from straightens her legs. A harness ballgag was tightly buckled all over her head and completed by locking all the buckles with a lock. She tested her gag and found that she could not make out any meaningful soft moaning.  A vibrating toy was placed on her private and was set to random setting. the vibrator was the most powerful toy she could get and yet it could it could last for two day when the toy was fully charged.

Now she was left with her arm to be restraint. She place the zipperbot's remote control along with the locker's lock and keys on the floor beside her and start to fit her arm into armbinder and forcing both her hands into the tight pouch at the end of armbinder. Then she push the button with her finger trapped inside the armbinder and once the remote button pushed, the zipperbot works itself all the way up slowly with a small zipping sound heard and she knew the whole process take about 10 minutes for it to finish zipping up the suit and the process cannot be stop by any mean.

Sunny always enjoy this moment where the zipperbot was like her captor, teasing her by slowly but firmly taking her freedom away. The zipping process was slow but Sunny could felt that the room for her arm was getting less. Once it went over her elbows, the tightness of the armbinder forced her elbows touched and no way she could separate them or slipping her hands out of armbinder anymore. But before the zipperbot finish it's job, Sunny heard a creaking sound and she was terrified. She knew that someone had opened the locker room's door and she was panic. She tried to command the zipperbot to unzip the suit but the zipperbot was not responding to the command before the zipping process complete. She try to grab the remote but she couldn't grab anything with her trapped hands. Sunny heard a female was humming music and she was approaching her. She was running out of time and has to hide before she was caught red handed but with the belt attached to her armbinder and ankle cuffs there is no way she could run away...