Put your hand on her ass
From Create Your Own Story
You walk behind your mom and admire her ass under her skirt. You have an idea what she's got on her mind. You decide to test it. You reach out and feel up her ass. She doesn't respond immediately but after a moment's hesitation, she turns around.
"What do you think you're doing?" she asks sternly.
You reach both hands around her waist and grab her ass firmly. She leans back against the counter and you bring yourself closer to her. You look each other in the eye.
"We can't," your mom reminds you. "I'm your mother."
"We can. I won't tell."
"Go to your room."