3. Remember your son is MUCH more embarrassed than you are.
Yes, it’s awkward for everyone involved, but you have the benefit of maturity and knowing that masturbation is normal. Your son is probably not only embarrassed but also a bit ashamed of what you saw. It’s important that you remain calm about the situation, and explain to your son that there is no need to be uncomfortable, it’s a fact of puberty for boys and that you love him.