This is a very awkward situation. First, it's important to respect his privacy as much as possible. Try not to make a big scene right away. You could talk to your best friend privately and let them handle it in a sensitive way. After all, it's a personal and embarrassing matter for the son, and your friend as a parent is in a better position to have a proper conversation with their child about appropriate behavior.
Approaching your friend about this is not easy. First, you need to make sure you are in a calm state of mind. You can start the conversation by expressing your concern for their son's well - being. Say something like 'I care about your son a great deal, and recently I witnessed something that I think you should be aware of as a parent.' Then, gradually introduce the situation without being too graphic or judgmental. Let your friend know that you are bringing this up out of love and concern for their son and their family.
Well, it's an awkward situation. First, try not to overreact. You could give your friend some privacy immediately. Maybe later, when you both are calmer, have a conversation about boundaries and respect in a non - judgmental way.
First of all, don't overreact. Masturbation is a normal part of sexual development. Try to have an open and honest conversation with him in a calm and non - judgmental way. Let him know that while it's normal, it's also a private matter that should be done in appropriate places.
The simplest way is to pretend you saw nothing. Just turn around and leave as if it was a normal thing. This can save both of you from extreme embarrassment.
Just accept that it happened and try to laugh it off (although it's really hard). Don't dwell on it too much. The more you think about it, the more embarrassed you'll be. Focus on other positive things in your life.
This is an extremely embarrassing situation. First, you should immediately stop what you're doing. Then, try to apologize sincerely for making her uncomfortable. Avoid making excuses. It might also be a good idea to keep your distance from her for a while to let the awkwardness subside.
This is a super embarrassing situation. One option is to quickly and quietly retreat. Your friend is likely feeling extremely mortified as well. You could also consider sending a text later (if you communicate that way) saying something like 'I'm sorry I walked in on that, let's just move on'. However, if this becomes a pattern or makes you uncomfortable around your friend, you might need to have a more serious conversation about boundaries, but that should be a last resort as it's such a personal and private matter.
No, it's not normal. Such activities are inappropriate and violate social and moral norms. These are private and personal matters that should not be shared or engaged in with friends in this way.