How my brother learnt.
My mum has been bathing my brother (Jack) since he was young and when my brother was six, my mum began working and was not home most of the time.
So as an elder sister, I was tasked to take over the job of bathing him as my mum was not of the idea of allowing Jack to bath on his own at that time. I was eleven then.
Once when he was eight, while I was bathing him, he raised a question 'Sis, what is masturbation? My friends were discussing it and I feel very left out not knowing anything.' See that he was being so left out by his friends, I decided to teach him.
I told him not to tell my family members about it and proceeded to teach him. I held his penis in my hands and stroked it slowly. He just sat there in the bath tub looking at my hands going up and down on his tool. Using my left hand, I brought his hand to my breast (32c) while I continued to stroke him. He started fondling my breast through my t-shirt and before long, my white t-shirt became translucent due to the wet hands and my nipples could be seen.
His penis went hard and soon I heard him telling me 'Stop Sis, I feel like peeing, stop please.' I told him to relax and let it go. Before long he started to shiver a little his penis jerked and warm sperm filled my hand. He seemed shocked and thanked me for the lesson learnt.
I had a nice session with my pussy after the bath and many other sessions with him after the incident.