I stumble upon my stepdaughter's illicit encounter with a stranger through the window

The other day, I was hanging out in the backyard when I happened to glance over at my stepdaughter's room. To my surprise, I saw her engaging in some pretty wild action with a total stranger through the window. The sight of her writhing around on the bed with this mystery man was too much for me to resist. I had to get a closer look, so I sneaked into the house and hid by the window to watch the rest of the show. The guy she was with was clearly not her father, but he did have a sizeable member that was more than enough to satisfy her. After some initial hesitation, she eagerly took him into her mouth, skillfully working her tongue around his shaft. Once she had her fill of his throbbing cock, she straddled him, riding him hard as she moaned in pleasure. It was a sight to behold, and I couldn't help but feel a twinge of excitement coursing through my veins.