Mom taught me how to masturbate guys. You need to know this, she said. You're getting to an age when boys will pester you for sex. Usually you can control them by masturbating them but you need to know how to do it. She explained to me how she was going to handle it. She got a friend of her's called Jim, who sometimes worked for us as a handyman, to be a guinea pig. I'd already met him and said I'd be okay with him. At the time, he was about 30, a biggish guy with long hair and okay looking if not very bright. When he arrived we all went up to mom's bedroom and mom told him to take his clothes off. He obeyed without demur or embarrassment. When he was naked, she patted his ass and made him go take a shower in her bathroom and I went in with her to watch. It was very relaxed. Jim had no problem being naked in front of me and I liked seeing his big, white, hairy body and his cock which was surprisingly small because it was still limp. I'd never seen a naked man before apart from an occasional glimpse of my dad who didn't count. In the shower, he soaped himself all over and fondled himself openly while chatting with my mother. When he stepped out of the shower, she gave him a towel to dry himself then she picked up a bottle of lube and we went back into her bedroom. She spread another towel on the bed and Jim lay down on it on his back. His nude cock was now standing up hard and was impressively big. Mom lay one side of him and told me to lie on the other. Okay, she said to me, simple ; masturbation is taking a guy's penis in your hand and moving it up and down until he reaches orgasm and cums. I've already explained to you what an orgasm is and now your going to see one. In fact, you're going to make it happen. Ok Jim, honey, we're going to go. She reached out her hand and gently eased Jim's foreskin back. Then she squirted some lube over the head and smeared it down the shaft of his cock. While she did that, she explained that guys masturbated themselves but also liked women to do it for them. Jim grinned and said yay to that. Telling me to watch carefully, she wrapped her hand round Jim's cock and began to move it up and down rhythmically for a few moments. Jim put his head back and murmured yeah, oh yeah...that is so good. After a minute or so, mom said okay now its your turn. She made me take Jim's cock in my right hand where it felt big and hot, very smooth with the lube and both hard and yielding. I liked the sensation at once and began to masturbate him like she'd shown me. Mom told me to vary the speed of my wanking rhythm and the pressure of my grip from time to time and I very quickly got the hang of it. I could tell so because Jim was making more and more noise, groaning and saying yeah, fuck my cock and jerk me, honey. He got more and more excited until suddenly he yelled fuck as spurts of milky cum erupted from his cock all over my hand and his belly. Yuk, I said but my mom laughed and said that's why we'd put the towel down. Jim was flopped back on the bed and my mother, all business now, said we'd wait for him downstairs. When he dressed and came down, he was perfectly natural as if what we'd done was a normal everyday thing which I now realise it was. Mom gave him a beer and we chatted while he drank it and politely answered mom's questions about his personal masturbation habits. After a bit, he got up and said he had to go. I'd like to thank you kindly for that, Mrs Wilson, he said to mom. I really enjoyed it. Don't thank me, thank Mary, she replied. He grinned and pecked my cheek and said thank you Miss Mary. I didn't accompany them when she went to show him out but through the open living room door, I saw her slip him a couple of bills and squeeze his crotch as she did it.