It's hard to say exactly, but she could have expressed surprise verbally, or shown it through her body language like widening her eyes or taking a step back. Maybe she also thought about the implications of her son's action and how it affected their relationship.
She might have been shocked at first and then maybe felt a bit embarrassed or confused.
She should stay calm. First, she could give her son some privacy to compose himself. Then, have an open and honest conversation about appropriate behavior and privacy at an appropriate time, without shaming him.
Mom was shocked at first. She felt betrayed in a way because he had entered into a relationship with her while being gay. She was also angry that he hadn't been honest with her from the start.
She should first stay calm. Reacting angrily right away might make the situation worse. For example, if the kids hid her things like in the previous story, she could firmly but calmly tell them that such behavior is not acceptable.
She can praise his creativity and hard work right away.
First, look away to respect her privacy. Then, in a calm voice, say something like 'Mom, I'm sorry. I didn't mean to intrude.' And then, give her space. If she wants to talk about it later, be open and honest about it, like explaining that you just happened to be there by accident and that you'll be more careful in the future.
Kendra Wilkinson was likely disappointed and angry. Her mom selling the story meant that private family matters were made public, which can be really uncomfortable. It might have also made her feel betrayed as it was a very personal aspect of her life that was being exploited.
The mom should keep her cool. She could ask her daughter gently why she is wearing lingerie. It might be a simple misunderstanding or the girl might have a valid reason, like it was part of a fashion project for school.
The mom could stay calm too. She can start by asking the girl why she's wearing it. If it's a simple innocent reason like trying on an old piece from the attic, the mom can just laugh it off and tell the girl it's not appropriate for everyday wear.
Apologize right away. Say something like 'Sorry, mom. I shouldn't have worn it without asking.'
The mom can encourage the son to discuss the stories with his dad directly. This helps in building a closer father - son relationship.