Bound Rena - Part 3: The Merciless Machine

Today is a punishment day for Rena, why? Because she couldn’t last five minutes in Mistress Ju’s experiment the other day.

On the fourth minute of random shock torture, Rena felt her stomach twisting when the shock suddenly spiked around her waist, causing her to shout “River”, her safeword.

Mistress Ju had spent a lot of time to perfectly wrap Rena in the cast, but it had to be broken almost immediately. Although the fault is on her side as she did not warm up Rena enough before switching on the random setting, she is disappointed.

Rena is also feeling a little down, not because she could not enjoy the session yesterday, but she will not receive her promised reward.

Mistress Ju walked Rena on all fours like a dog. Rena is naked like all pets should be, she has a thick spiked black collar with a red leash which mistress Ju is firmly holding on to – she doesn’t want her pet to run away from the punishment.

Mistress ju, without saying a word, made her pet sit inside a wooden box, this one is less than half of Rena’s size. There are three holes at the top to lock her neck and wrists, and three at the bottom for her legs and something to get into her bottom hole.

After making sure that Rena can fit in comfortably in the box, Mistress Ju unlocked both the top and bottom sides. The holes are now big enough for Rena to put her limbs and head through, so she did that.

Mistress Ju locked the box again, Rena is bound now, there is no escape, so she removed the leash from Rena’s collar.

The box was on wheels, Rena hadn’t noticed that, probably because she was too worried about what the punishment will be. Ju pushed the box towards the wall, Rena could not see where she was being taken to.

Once the box reached near the wall, Rena could hear Mistress Ju attaching the box to something metallic behind. Though Rena is scared, she knows that Mistress Ju is still kind and will not make Rena go through something she cannot handle, so she took deep breaths to calm herself.

“I see you are trying to relax, good girl, get ready for your blood to rush to your head, my pet.” Ju said while smirking. Rena tried to look up, but couldn’t do much as her thick collar was stopping her from bending her neck.

Mistress ju pressed a button which slowly raised the box three feet high. Gently caressing Rena’s cheek, Ju pressed another button that flipped the box upside down slowly. Rena could feel her breasts pulling the other way and blood rushing to her head, it was a weird feeling, something that Rena is still not used to.

Rena felt something touching her butt hole, it’s cold lube, Mistress Ju usually use a warm one to make it easy for Rena, but today is a punishment day, so Rena will not get the luxury.

Mistress Ju pushed a dildo inside Rena’s butt slowly, it is not as thick as last time, it is not deep either, after moving it in and out a few times inside Rena, she stopped the dildo midway.

Now the preparations are done, so mistress Ju took her cane and tapped on Rena’s feet, “Are you ready?” Ju asked. “Yes, mistress”, Rena replied as she prepared herself for a brutal caning.

To Rena’s surprise, mistress Ju did not cane her, instead she pressed another button and said, “I know you can handle a pounding, my pet, but today I’m using a new machine, let me see what your limit truly is”.

The machine slowly started moving the dildo inside Rena, and it is steadily increasing the speed. Rena can see that Mistress Ju has a speed dialler with her, she is controlling the machine manually this time. Rena is in relief, as Mistress Ju knows her better than a machine could ever.

As the machine was pounding like there was no tomorrow, Rena didn’t feel it like a punishment, she felt like it was the promised reward, may be Mistress Ju wanted to do this all along.

The machine is not going too deep, but it was fast! Rena felt like her whole body was vibrating, the box was also vibrating a little. She could feel even her cheeks rippling like in the slow motion videos she used to watch.

Rena gasped for breath, she couldn’t control her voice, she screamed, it’s a bit painful, but the orgasm ripped through her before she could even ask for permission. Mistress Ju stopped the machine while Rena was still cumming.

Mistress Ju caned Rena’s feet hard. “I’m sorry mistress” Rena said while still cumming. Ju canned her a few more times after Rena came so that she will feel the pain this time. Rena’s body is now more sensitive, and the canning hurt her a lot, it left a mark under her feet, she won’t ever cum without permission again. “I’m sorry mistress, I will ask from now own” Rena pleaded.

Mistress Ju turned the machine on again, “you don’t need to ask any more this session” she said as she increased the speed. “This can go up to 1000 strokes per minute, you know?, It just won’t be deep” Ju smirked.

Rena did not hear that as she was receiving another forced orgasm. She wondered how long this will last, she always wanted to experience this, but she had never cummed so fast before, and she did not know how much it would hurt.

Mistress Ju played around with the speed as she watched how Rena reacted. She gave Rena a few ruined orgasms by stopping the machine and canning Rena’s feet and thighs.

The session lasted only thirty minutes, and the last minute had left Rena with the fastest fuck of her life, she couldn’t do anything besides scream in pain and pleasure.

Mistress Ju stopped the machine, removed it from Rena, and turned the box right side up again before leaving Rena in the box.

Ju said, “I’ll be back” and left the room while Rena was still struggling to catch her breath.

Rena understood that there will be more, and while today might have seemed like a reward, it was a true punishment, her leaking butthole will need a few days to recover from this.