That was shocking, I couldn't take it anymore. I suggested teaching him about sex and he agreed. Since he had learning disabilities, I thought that verbal education probably won't be enough. I needed to show him in practice. I asked him to undress. He was willing to do it, but he was too shy to undress in front of me, so I undressed him gently. I undressed as well and we stood fully naked in front of each other. I started by teaching him about my body parts and how they functioned. It was the first time he was seeing a naked woman. I allowed him to touch every part which I was teaching him about, and we went on one by one.
When the lesson was over, I noticed that he was very horny. I thought it would be cruel to leave him like that. I asked if he needed my help to reach an orgasm (it was obvious from his erection that he was very eager, but I wanted to be polite and also didn't want him to feel dominated). He said yes, so I hugged and gave him a long kiss on the mouth. Then I asked him to lie down. I started stroking his cock, at first with my hands and then with my breasts. Then I sucked him until he cummed. I swallowed all of his cum. He had a little rest and then I showed him how to penetrate a woman and give oral sex. Despite it was his first time, he performed very good and managed to satisfy me. I kissed him again and reminded him that having sex doesn't change our relationship and he shouldn't confine himself to masturbation (which I taught him) or loveless sex, but should look for true love.
On the next sessions, I taught him about safe sex, pregnancy, condoms, hygiene, how to treat and please a woman and anything he needed to know about relationship and sex.
We remained friends and had sex a few more times. As I said, I encouraged him not to confine himself to loveless sex, so I helped him to find a nice girl. They fell in love and moved on with their lives.
That was the best sex which I had in my life, although it wasn't the physical part which made it the best (despite it was very good from a purely sexual point of view!); the thing which made it the best was helping Johnny and enabling him to have a relationship and normal sex life.
However, if you want to help someone with a similar problem, be sure that you are not mistaking your desires for someone else's needs. Don't rush into anything. Try to inform their parents or caretakers about the needs which they neglect. Be sure that they are mature, intelligent and responsible enough to have sex. Always put them first and never ever take advantage of them.