"If you have already established a good relationship with your brother, already confided in one another about other things, it should be relatively easy to broach the subject.
I would begin the conversation - in private, of course - by asking him if he wakes up in the morning with a boner. Explain it's normal, it's important that it does, and why. Ask if he has become aware of his cock getting hard at weird times. Then you can explain that frequent boners ensure the health of the tissue.
If you can, get some labeled diagrams that show the process of going from soft to hard. Your parents are much less likely to freak out if they discover diagrams of male genitals rather than photos. At least diagrams can be explained as education.
You need to tell him you understand how sensitive his cock gets, and you know how good it feels to play around with it, that it's normal and healthy - stress that you do it, that all guys do it - even if they're married. (Unless he's been injured, or has some other medical issue, yes, your father jacks off.) You might also explain that we masturbate for a variety of reasons - not just because we're horny, or because it feels good, but because it's good for our health.
By your brother's age, he should have already had an ejaculation. Ask if he's had a wet dream - woken in the middle of the night cumming, or noticed any wetness or dried semen on his pajamas in the morning. If he hasn't, well...it should happen very soon. (Personally, my opinion is this: If a guy hasn't cum by the age of 14 at the very latest there is a physical problem which should be investigated by a doctor.)
Don't be surprised if your brother gets embarrassed at first when you begin discussions - yes, it will probably take lots and lots of talks to teach him everything he needs to know. Just keep calm yourself, don't show any hesitation in explaining something, and encourage him to ask questions.
Drawing a picture can come in handy sometimes. You can drop your pants to point to various areas if need be, but do not touch his genitals in any way, shape or form!"
And as nature forces our hands, we masturbate.
There's no reason to have to hide it - especially from a brother
|E (Thanks to French Patrick for these 4 gifs)|
And, as my brother and I did, we eventually included a few of our buddies. We experimented, we taught one another.
Have you ever mentored a sibling or friend?