My brother had an car accident when my sister and I were 13 and 14. He was in a coma for a long stretch, then came home, pretty much with no function to his mental capacities. He was 19 when this happened. My mom took care of him during the day, and when my sister and I came home, she went to work. Taking care of him was mostly just feeding him like a baby a few times a day, giving him water, and helping him pee in the bottle he used. He wore a diaper, but he would make a noise when he had to shit so sometimes we would help him on the toilet. He never seemed to show much response to anything except eating, drinking, or shitting. We would turn on the TV and he pretty much just looked at it blankly, watching the colors I guess.
One afternoon, my sister called me in and asked if I wanted to see something cool. I said sure. She lifted up my brothers night shirt and I saw his diaper was not on. I said what are you doing, if he shits on his chair we will have to clean it up. She told me, just watch. She then took off her shirt and put her tits right in front of my brothers face. It seemed to get his attention, and my sister laughed and told me to look down. His dick was standing straight up. Now, because of the situation, we had seen my brothers dick every day, but to see a dick totally erect was new to the two of us. We touched it, played with it, and my sister decided to stroke it and it got even more erect, then suddenly it shot off hitting my topless sister as she squealed in surprise.
So, we used to play this game after school everyday. We took turns being the one to get it started. He seemed to really like it when we rubbed our boobs in his face, getting very erect almost immediately. It was quite big we thought from looking at porn on the internet. I told my sister one day, we should try sucking it, as I was told guys like their dicks sucked, and we had a practice cock right here. I went first, I put the end of it in my mouth, and I could feel it twitch some, he liked it. I could only get about half of it in my mouth that first time. I did not want his stuff in my mouth so I did not do it long. When I thought it was getting close to where he usually shot off I started to take my mouth off and it went off, hitting my face and mouth with a really big one. My sister laughed at me and told me I was a dope. The next day, though, she wanted to try it. She, like me could not put it all in her mouth, and she sucked it. I told her she better take her mouth off soon, but she kept on going. My brother made his weird little noise that he made when he came and she was still sucking. She took her mouth off. I asked if he came and she said he did, but it really did not taste too bad, and she hated cleaning it off herself so this was better.
We did this for a while, and both my sister and I thought the same thing. We want to try fucking him. We were very scared of getting pregnant and were too nervous to buy condoms. One weekend, my sister came back from a sleepover at a friends house. She called me into her room and said, look what I got. She had six condoms. She said she took them from her friends parents room. That there was a big box of them and she figured six would not be missed.
We could hardly wait for the next day. As soon as my mom left, we took my brothers diaper off and by now, it did not really require the boobs in the face, the diaper went off and the dick got hard. My sister went first, she took off her clothes and we both got the condom on him, after a little bit of struggle. She sat on his lap and put it just inside, she said it hurt a little but she had read that was common on the first time, she made a few little squeals as she slowly pushed it in, a little blood came out of her, then she said it seemed ok now. She went up and down it until my brother made his little come noise.
I asked her how it was. She said it was a little painful and difficult at first, but then began to feel better. She told me you have to do it tomorrow.
The next afternoon, I did like her, took off all my clothes. His dick was hard almost immediately so we put the condom on, and we were better at it this time. I sat on it and put it just in me, I was nervous and felt resistance when I tried to go down further, so kept going just up and down a little with it barely in. My sister said do it for petes sake, don't be a chicken. I finally got the nerve to push harder and I felt the resistance give. It was easier now and I gradually went all the way down until it was all in me. My sister was right, it was pretty good once you got over the first part. My brother made his come noise and I got off. We pulled his condom off and washed him up.
We got the nerve finally to actually go to the drug store and buy some condoms. We told the guy our dad had asked us to pick them up, not realizing till later how weird that sounded, and teased each other about it. We practiced fucking and found after a while, it really felt good. As we did it more, we found we would get really wet down there doing it, and sometimes had an orgasm, which was really eye opening. Then we found that after my brother came, if you gave him about a half an hour, and then sucked him, it would get hard again, but now we could fuck him longer. We took turns getting the second long fuck, as it was clearly the best. Years later, when my sister and I had boyfriends and had real sex, we blew the poor guys minds.
My mom got assistance from an agency and eventually hired a woman to take care of my brother in the afternoon, and my sister and I had boyfriends by this time. Whenever my sister or I walked into the room where he was he got very excited. His nurse used to say, your brother loves you so much, he does not react to anyone else like that. We would just smile and say we love him too.