The son might have felt more embarrassed or ashamed, knowing that his father was witnessing the spanking.
The son's reaction could vary greatly. If he was close to his father, he might have looked at his father with pleading eyes, hoping for some sort of rescue. On the other hand, if he had a rebellious streak, he could have glared at both parents, vowing to himself that he would get back at them in some way. And it's also possible that he was so focused on the pain of the spanking that he didn't really pay much attention to his father watching at first.
Well, it depends on his parenting beliefs. If he believed in strict discipline, he might have just watched silently, thinking it was a proper way to correct their son's behavior. However, if he was more lenient, he could have been quite uncomfortable and maybe even stepped in to stop it later.
He could first calm down the situation. For example, he can separate his wife and son gently and then talk to his wife privately about why she resorted to spanking.
He might have been excited. Kids are often open - minded and enjoy new experiences. He could have thought it was cool to wear different clothes and look different for a change.
He could have different reactions depending on their family's discipline philosophy. If they generally agree on strict discipline, he may support his wife's action silently. However, if he believes in more gentle ways of teaching, he might step in later to comfort the son and have a talk with his wife about alternative methods.
The son might feel mortified. He may not know what to say at first. But he should try to stay calm and not run away or act defensively. He can later have an honest conversation with his mother about how he understands it was inappropriate to do it in a place where he could be caught, and also learn from her about privacy and healthy sexual habits.
Goku's reaction could be a mix of shock and happiness. On one hand, he never expected to actually meet his parents. On the other hand, he has always longed for a family connection. He might start asking them a million questions right away about their lives, Saiyan culture, and what it was like when he was born.
He could also try to act as normal as possible and hope that his mom doesn't make a big deal out of it. He may mumble something like 'It's just a normal thing' if he has the courage, but this can be really hard for a young boy.
He would probably be extremely embarrassed. He might quickly cover up and avoid eye contact. He could also just stay silent as he doesn't know what to say in such an awkward situation.
He might feel embarrassed at first. After all, it's not the typical way he presents himself. But if he's in a comfortable and accepting family environment, he could also find it quite funny.
The son could ask for some time and space if he feels too overwhelmed in the moment. Then, when he's ready, he can sit down with his parents and have a proper conversation. He can also share some educational resources about homosexuality with his parents to help them understand better.