This is my first attempt in writing a catsration story.

I came across an ad on an erotic website: a man wanted for sex with an 18-year-old petite blonde, a one-time attempt to impregnate her. I come to the meeting. The girl is really beautiful, very shapely and she is ovulating today. She is accompanied by her mother. She calmly told me without any embarrassment -on this meeting your task is to empty your testicles and shot all your sperm in my daughter's vagina and thus try to impregnate her. You can cum inside her many times until you get rid of all the semen. If you agree to have sex with my daughter, you must remember one thing. Neither my daughter nor I want you to have a child with any other woman, so right after your last ejaculation, we will cut open your sac, take out and cut out your testicles.

I said yes, I like this agreement. Satisfied mother smiled and said good boy, do your duty. The girl undressed, took off her clothes and unfastened her bra. She had a beautiful, shapely, medium-sized breasts. She took off her panties, revealing her groin with a short pubic hair and the clearly marked slit guiding to her vagina, my goal as a man. During this time, her mother took off my shirt, pants and panties. A fully erect penis has already sticked out under them ready to do his job. The older woman was not very interested in the penis, her attention was pointed to my scrotum. After briefly feeling its contents, he told to the girl. My little girl, this boy has one testicle, but it looks healthy and is full of semen. The girl replied that's great, let him empty it in me and then it will be easier to deprive him of the possibility of fathering any other children. The girl has already lye on her back, spread her legs on the bed and encourages me, come on, baby, give me everything that the testicle has inside. I lie on top of her. She grabed my stiff penis and guided its glans directly to the entrance to her vagina. With a quick thrust inside her pussy, I signed the death sentence to my testicle. The wonderful touch of her body, moisture and tightness of her pussy made me feel a moment later that I'm about to ejaculate.  I couldn't stop it. With the last thrust before orgasm, I pushed myself as deep as I can into her pussy. My cock exploded with ejaculation near the cervix of her young uterus. The penis, testicle and my entire reproductive system pulsated like crazy in long series of orgasmic contractions, filling her pussy with many portions of semen. After a while, I pull out of her, enjoying the sight of a few drops of my sperm flowing from her vagina. The girl was so beautiful and the prospect of impregnating her was so arousing that a few minutes later I was ready to make another cumshot into her vagina. After rubbing the inside of this wonderful pussy for a little longer, the girl received another but much smaller portion of semen, and finally, after a long and exhausting intercourse, another portion. The last one was very small, maybe 2-3 drops. The girl's mother, who was constantly looking at our connected reproductive organs from behind, said: This is the end of his sperm, this boy's testicle has fulfilled its function, so it's time to remove it. At that moment, she opened the drawer and took out a set of tools and reagents needed for castration. She asked me to lie comfortably on my back and spread my legs on the bed so enable her a easy access to my only male treasure.  Of course I did as she asked. The girl stood right next to her. The mother disinfected the skin of the scrotum. In the place where she planned to cut the scrotal skin, she injected an anesthetic in it. She then took the testicle in her hand, penetrated it with syringe needle and injected the rest of the anesthetic deep into  my only factory of sperm. She took a scalpel from the tray and ran it across the taut skin of the scrotum along the entire length of the testicle. The scrotal covering separated. Through a long, blood-reddened incision, the elderly woman gained access to the smooth muscle of the scrotum. She cut it cleanly with the next cut of the scalpel. She squeezed the testicle from underneath, pushing it through the incision. She cut through another tunic, then the muscles of the spermatic cord, until she reached the last tunic - tunica vaginalis. The girl carefully watched the entire process how her mother is approaching to the source of my fertility. When only the tunica vaginalis  remained to be cut, she passed the testicle to her daughter, addressing her with words. My lovely girl, this boy's seed is inside you.  You feel it in your pussy,  and his testicle is yours. So take from him what is already yours. I felt the girl press the testicle to the last covering with her tiny fingers and with a gentle movement of the scalpel, cut it. The white, smooth, shiny gonad, covered with a net of small blood vessels, jumped out from the incision. The girl was delighted. Mommy, how beautiful it is, defenseless and with the epididymis emptied of sperm. It lies like a beautiful gift in my hand, and just moments ago it tried to impregnate me. With her mother's help, she began exploring the spermatic cord that connected my testicle to my body. She found blood vessels and a thick white tube - the vas deferens. Wow, its so hot to have in my hand this hard white tube w that several minutes ago has delivered all your  male seed from the testicle to my pussy. The mother tied a vas and blood vessels tightly with surgical thread, and cut off the protruding ends of the thread. The girl took the testicle in one hand and the scissors in the other. She put a open blades to the taut spermatic cord and her mother turned to me. Boy, this little part of your body led you to my daughter. It  gave her today everything that a male testicle can give a girl. Your role as a man is over. Your entire sperm is either in my daughter's pussy or in the testicle that she is holding in her hand. The girl added, you have a nice fat penis with a wide glans. He gave me a lot of pleasure - although that was not his task today. I'm glad that I was the last lover who took pleasure in being penetrated by him. I will remember him every time I look at this source of his size of stiffness and desire that I'm holding in my hand. After these words, the girl gently closed the scissors. The blades cut the blood vessels, stopping a blood supply to the testicle forever. After a while, the girl smiled at me and has cut my vas deferens. While her mother stitched my scrotum, the girl stood right next to me.  She kept a last source of my fertility and manhood was in her palm and felt how its cooling down and dying. The drops of my semen  has turned into transparent color and started flowed of her pussy and ran down her thighs. Whether I impregnated her or not didn't matter anymore.