Alberto was pretty fed up with how his life was going,  especially his dead end job. He was sick of working at a fast food joint where he has to dress as a chicken to serve the customers and to make matters worse his sister was home with some of her friends just enjoying the summer weather in the pool. He always had the hots for Blondie,  his sister's best friend and she was out there catching some rays. He asked them to keep it down because he had some studying to do but couldn't resist going to the bathroom and staring at Blondie through the window. He started fantasizing about getting his mitts all over her bodacious body and having his way with her. He started jerking off to all those images flooding his mind. Blondie unwittingly walked in on him and caught him with his dick in his hand. Maybe next time all the embarrassment he felt will remind him to make sure the door is locked.