It had been a hard day at the precint. The serial killer, named The artist by the press, had acted again and eveybody was nervous from the mayor down to the last rookie. Brina would be alone at home, since her roomate, Liu Shan, was visiting her mother, and wouldn't come back in a couple of days. So she would just prepare a nice dinner for herself, relax a bit on the couch and then masturbate.

Once she was done with the routine of the day, she went for the fun part. With a wide smile she peeled off the clothes, closed the blinders quickly and got ready for the release she very much desired. She placed a dildo with a suction cup firmly on a chair. With a bunch of ropes, a short and thick penis gag, her used panties of the day, a scarf and her handcuffs, the party could start.

Brina's pussy was kept closed by a combination padlock. The hasp passed through two holes pierced on her skin, slightly above her outer labia, that were kept permanently open by two soft plastic eyelets. The padlock instead was made of hard plastic, and more light than it seemed according to its size. It wasn't there to protect her anyways, could be broken easily.

On the crotch right above her labia she had a scorpion tattooed, partialy covered by the trimmed hair. It was about then inches tall, looking upwards with her pincers open in a menacing pose. The tail went down and slightly to the right where it finished, right when it got into contact with the rim of the eyelet, through which the hasp of the padlock passed. It was supposed to look as if the tail was entering in Brina's pussy through that hole. Along with the padlock, both symbols were meant to be a message to herself, about having her desires under control and not letting dangerous people in her life. With that in mind she went on with the masturbation process.

The first step was covering the gag with her panties in such a way that the soiled part would be in contact with her tongue. With that done, she could cinch it around her head. After removing the padlock she sat on the chair getting the dildo deep in her pussy, facing the backrest. With several lengths of rope she tied her knees to the legs of the chair. Leaning forward she looped a rope around her neck, then guiding it behind the backrest and under the seat, she looped it around her waist, tying the knot on her back. After that she covered her eyes with the scarf. The ropes weren't tight but wouldn't let her move away from the chair more than a few inches. Grabbing the keys to the handcuffs she threw them up so they hit the ceiling and fall somewhere close by. At last she cuffed her hands behind her back. If somebody opened the door to her bedroom, would undoubtedly see her from behind, but the house would be only for her, for the day.

It was a simple setup, but effective. In the dark, tied to that chair with the dildo deep inside her she rode the toy, buckling up and down until she reached the orgasm that was denied earlier. Other times when she had used less rope she moved too much and either she hurt her ass against the seat or the dildo slipped away. Restricting her movement helped her focus all her energy on her thighs and hips, and so the dildo was always where it should. After a brief rest she rode the dildo a second time, more slowly, giving it more time to build up her arousal, and therefor more time to enjoy it, if not as intensely.

When she was in highschool, after a failed, toxic relationship where bondage was very present, she promised to herself that she would keep playing, but with her own rules. She would do the kind of bondage and discipline she liked and understood, while focusing on her career and her job. Maybe in the future she would look for another relationship, but certainly not like the one she had left behind.

The rules she set for herself, that she hoped would make her a good sub were:

1.Food always healthy. Well cooked. Carry tuppers to work. Follow a diet. No alcohol or toxins.

2.Wake up early. No lazying around. Stretching, dumbbells and jogging every morning. Learn to dance and move with rhythm. Have a good ass.

3.Be polite when possible. Flirty, but not slutty. Constructive comments, no mean words. Offer help when needed, but don't be naive. Sit straight, legs together, act like a lady.

4.Dress properly. Ironed clothes. Long better than short. Elegant better than comfortable. Of the right size but not too tight. Not much colour. No transparencies. Light make up. Orderly hair, ponytail or bun. Subtle cologne. Even at home in case of unexpected visitors. Slutty only in the intimacy.

5.Clean and tidy house. Have snacks for unexpected visitors. Be boring as fuck so they don't come back.

6.Emotions under control. Prioritize duty over pleasure.

7.If done all this, at the end of the day get reward, but only while in bondage.

When she had satiated her excitement, she started the process of freeing herself. First she undid the knot on her lower back, freeing her neck. Then she maneuvered her torso down and to the sides to untie her kness. Still blindfolded she had to look for the keys to her handcuffs. She found them on the floor and reaching them with her hands bound behind proved to be a little challenging. At last she could undo the gag and blindfold.

Shan, her roommate, knew about Brina's insistence on following rules and routines, and that those habits had a sexual appeal for her. Shan claimed to have a bit of experience as a dominatrix, didn't explain from where, and had offered her assistance, but Brina had deep trust issues and hadn't shown interest. Still Shan from time to time acted a bit bossy with her, maybe giving her advises using an authoritarian tone, or touching sensitive areas of her body in a playful manner. As those acts were occasional, harmless and often cheerful Brina quite enjoyed them, even if she didn't admit it. Shan had noticed her lack of resistance though. Despite all this Brina preferred to follow with the masturbation routine when she was alone, still not ready to trust other people.

She spent the rest of the night going over the information, new and old, about The artist's case. Since her house was going to be empty she could bring the documents. Otherwise she couldn't because she'd have to keep the investigation in secret. She had the whole weekend to go over all the information, without other people interrupting her.

Like all the other victims, the last one was a young woman, about thirty years old. Average height, in reasonable good shape, dirty blonde hair. Like the others she had died of an Ecs overdose. That drug was both a soft narcotic and a strong aphrodisiac, that had the capability of greatly weakening the mental resistance of any person, while producing very warm sensations on the crotch area. It made them both submissive and horny. Criminals used it often to rape people, most likely women as the drug was more effective on them. In big amounts it could produce a lethal alteration in the blood circulation.

Like the other girls she had been found either naked, or wearing very little clothes, in an alleyway, close to a nightclub, pub or similar places where people used to go to make acquaintances with relaxed criteria. A couple of times it had been close to a big private party. In all cases the corpse was found with a small plastic bag stuck in her vagina, and inside the bag a drawing made with a computer.

In all those drawings a woman with a similar physical appearance was involved in some sort of heavy bondage activity. Some of them were covered in ropes or chains in a very uncomfortable pose. Others were wearing some kind of attire common in BDSM activities such as latex catsuits or straightjackets. Others were trapped in a heavy contraption such as a pillory or an iron maiden. Most of the women were covered in wealts or cuts, but never seriously injured. Most of them had related accesories, such as gags, blindfolds, clothespins, or sexual toys. All of them were smiling, at least those that had no mask on.

The case was specially important for Brina. In part because all the women, both real and drawn, where very similar to her in shape and colour. But mostly because in her youth she had had a close friend that had proposed to do to her most of, if not all, the things shown in the drawings. Brina had the feeling that somebody, a person from her past, was sending her a message through all those dead women. And she felt responsible. If she was right she'd had to stop her old friend once again. Sadly so far she had no solid proof, no fingertips, no DNA. The witnesses only knew that they had seen the dead women talking with other person and leave the place with them, but the descriptions were always different. Their friends had saw no reason in the moment to be worried. They just left walking by themselves and happy and turned up dead the next morning. Only Brina had a suspect.