The beginning. My experience with chastity started while I was a senior in high school. I had quite the sex drive and masturbated at least twice a day. I also had bondage fantasies, and being without a partner, I was experimenting with self-bondage. One afternoon while my parents were at work, I got myself all ready for some fun. I tied myself down to the bed spread eagle, except for my right hand. That was attached with handcuffs looped through rope tied to my testicles and right thigh. To release myself, I had a handcuff key on a ten foot string tied to my wrist, that hung to the floor. It took about 3 minutes to pull the string in bit by bit to reach the key. I was lost in bliss, when I heard the sound of the front door open and close. In a near panic, I began reeling in the key, but heard footsteps coming down the hallway. The door to my room opened and even though I yelled 'keep out' my sister walked in. She took one look at me and said with a sick smile "You pervert! I knew you were sick!". I could not reel in key and keep myself covered, so I opted to stay covered since I was still rock hard. She looked closer at how I was tied up and saw the key - she untied the key from the string and laughed "is this what you want? Well, you have a problem, but I am going to help you because you are my brother and I care." She left the room for a couple of minutes and came back in with a long piece of rope. She tied it to my right wrist and the looped it around the headboard. She unlocked the cuff, she then pulled the new rope tight and tied it off, and had me completely at her mercy. "So" she said, "just how many times a day do you do this?" I told her twice and she looked me straight in the eyes and said "Do you think that is ok? Not too much? Because let me tell you, normal is once a month. You have a problem, and I am going to fix it. But first, I need to make sure you cooperate.". She then pulled out her digital camera, and took pictures of me, including close ups of my face and my erect penis. She said "I will be back in a few minutes, once I safely upload these to my server at work". Now my sister is five years older then me and is an engineer. She has always played with electronic kits and computers, and is quite good with tools and such. She even fixes her own car! She came back in and released my right hand. She then told me that she needed to see the extent of the problem, like a doctor studying a patient, and that I was to finish off what I had started. When I told her no, she reminded me that she had the pictures and that our parents would soon be home. With no choice, and much embarrassment, I did what she told me. She then said "That proves you are sick - that you could do that in front of your sister! I will release you now; go clean up and get dressed, and no more touching yourself until we talk tomorrow".