I don't really know what todo?

So I told my mom I was going to go read in the living room, and she said she would be out, she was going to go watch tv. And as I'm reading, I start hearing all this heavy breathing, and I'm like. Wow. She knew I was outside, and I left to go in the room. She came out asking where I was and why I was acting so weird. How do I tell her I just like completely heard her? Keep in mind, I have 2 moms.