The boy may become defensive and try to explain that they didn't mean to cause any trouble. The girlfriend might be more submissive and just accept the punishment. Later, they might talk to each other about how to avoid getting in trouble again with the mother. For example, they could start following the rules more carefully and asking for permission before doing things.
He should probably stay calm at first. Reacting angrily or aggressively would only make the situation worse. He could say something like 'I'm sorry for whatever I did wrong, but this is not an appropriate way to handle it' in a very respectful tone.
There was a boy called Henry and his girlfriend Sarah. Henry learned about hypnosis from a book. He asked Sarah if he could hypnotize her for a bit of fun. She said yes. As Sarah entered the hypnotized state, she pictured a world where she and Henry were the rulers of a beautiful kingdom. They had grand palaces and everyone adored them. Henry watched in wonder as Sarah seemed to be living out this grand fantasy, and when it was over, they both had a good laugh about it.
One great 'Beast Boy girlfriend' fanfic is 'Green Love'. It beautifully explores a relationship where the girl is understanding of Beast Boy's powers and his insecurities. It has a lot of heartwarming moments between them.
He should listen attentively. Look into her eyes, nod his head to show he's following along, and make small comments like 'Really?' or 'That's amazing'.
You could also try to shift the conversation to a more positive and relationship - building topic. For example, 'Rather than talking about that, let's talk about our next date or something really special we can do together.' This way, you avoid getting into an uncomfortable argument and focus on the good parts of your relationship.
Naruto would probably be initially shocked. He's a very loyal person, so he'd have a hard time believing it at first. Then he'd likely be very angry. He has a temper when it comes to things that are unjust, and this would be a huge betrayal. He might also feel really sad and disappointed in himself for not seeing the signs earlier.
First, take a deep breath and try to stay calm. If it makes you uncomfortable, be honest and tell her. You could say something like 'I'm not okay with this story, it makes me feel uneasy.'
She could be surprised. If she wasn't expecting it, the unexpected gift of a necklace would bring a big smile to her face. She might immediately put it on and admire how it looks. She may also give him a big hug and a kiss to show her gratitude for the thoughtful gift.