Dang! Wish I'd thought to do something like that with my dad. So much time trying to figure out how to see HIS boner, never thought to just flash mine.
I did exactly that to my German teacher when he gave me a lesson on the weekend. Everyone was out and I walked into the hallway and stood in front of the mirror stroking my rock solid cock waiting for him to notice. Eventually I heard the chair creek as he stood up and walked to me. Mumbling away in German. He put his hand on my shoulder and persuaded me down and he filled my mouth right there next to the front door!