I knew my girlfriend's 14 year old daughter was awake and watching us have early morning sex in the cabin of a small sailboat... We were in separate but adjoining beds. She thought we were being discrete, but I pulled the sheets off of us enough to allow [Annie] to see me moving inside. I avoided looking at her, but did when I started to come. She stared intently as my body tensed and my shaft throbbed halfway inside. It was was one the most intense sexual experiences I have ever had...