I'm a 39 year old dad to an 18 year old daughter. My daughter has a friend named Gea who has innocently flirted with me for the last several years, no big deal nothing has ever happened.
My wife and I decided to renovate the master bedroom and bath, so we moved into the guest bedroom. The other day Gea decided to spend the night and slept on the couch. In the middle of the night I got up to pee and walked into the bathroom. There sitting on the toilet was Gea with her leg up on the hamper. She was rubbing her clit and looking at her phone. At first she tried to cover herself quickly, until she realized it was me. Then she put her phone down, opened her legs back up, and continued rubbing herself as she looked at me. I don't know why I didn't walk out, but I didn't. I just stood there and watched her until she orgasm. Then she got up, kissed me on the cheek, and left.