I have a sister who is three younger than me. We were close, had a lot of fun together but things began to change some when she was 12, started going through puberty, had her period, and became interested in boys. I was a bedwetter and had to wear diapers and rubber pants for that. My sister has also wet her bed and wore diapers like me, but once she had her periods she stopped, so I was the only one left in our family who still wore diapers. My sister was really popular, had a bunch of girlfriends and when they all got boy crazy, they had sleepovers and of course my sister had to tell them about me, that I wet my bed and wore diapers. Since I was older I usually stayed up later, and I mom diapered me once the girls were ensconced in my sister's room, so normally they didn't see me being diapered or even see me with diapers and rubber pants on. Even though they were supposed to be asleep, I could hear them laughing, talking, even whispering loudly since my room was next to my sisters. I was also a little turned by one of my sister's friends who was mature for her age, had pretty boobs and tended to wear shirts or undies that showed them off. I often played with myself under my diapers before falling asleep, thinking about that girl. Well, one morning, I think I was a senior in high school and my sister and her girlfriend had just started high school, my sister and her friend came into my room before I was awake, woke me up and told me mom told her to get me up and change because she was too busy and it was getting late. I was only half awake as she took my blanket off me and the two of them saw could see me in my soggy diapers and rubber pants, since that was all I had on. I tried but no way could I cover myself, so both my sister and her friend were looking at me and my wet diapers. Hone of this was a surprise to my sister and I didn't care at all when saw me in my diapers, wet or dry, but having friend with her was way more than I could handle, especially since I had played myself the night before thinking about her and big boobs. Even worse neither of them were wearing bras so I could see their nipples and breasts under their mostly see through nighties. Then my sister told me to lift my ass so she could take my rubber pants off. I did as she ordered, afraid to refuse, and her friend giggles and asks "does your brother always get so wet? Isn't he too old for this shit?" So my sister says "well, that's nothing. You know what else he does. Mom caught him playing with his dick after he peed in his diapers. I bet when I take his diaper off you can see what he did." My sister went ahead and unpinned my diapers, unfolded the front so they both saw my pee-pee, which by then was hard. I started to cry, jumped out of bed and locked myself in the bathroom, leaving my wet diapers and rubber pants on my bed and the girls laughing their asses off. I could hear her girlfriend tell my sister I should be spanked for still wetting my bed, but she also told my sister l it was too bad I was such a baby, wet my bed and wore diapers, because I had a really nice dick. I felt sort of proud when I heard that and told my sister I was ready for her to change me. She opened the door, by then I had wrapped a towel around me, and my sister told me to lay down on my bed so she could pin my diapers on. Normally I didn't wear diapers during the day, but today we were all going to the beach, it was a long car ride and I had to wear diapers and rubber pants when we went on long car rides because I had accidents. Her friend stayed in my room while my sister pinned my diapers on, smiling at me as she watched. I felt both so silly and little, but at the same time, aroused because I could see her boobs and nipples, and that she didn't have any panties on. I had a fun time with them, got to sit between them in the backseat all the way to the beach, went potty more than once in my diapers while the girls played around with me. They both had bikinis under their t-shirts and their boobs kept touching parts of me as we played around. Her friend even asked me if I liked wearing diapers and if I wet myself yet.