Young stepsister wants to be filmed while showering with me

My stepsis is the hottest girl I've ever seen. I've been fantasizing about banging her for years. Every time she's around, I can't help but stare at her perfect body. Yesterday, she walked in on me while I was taking a shower and she asked if she could join. I was shocked, but of course, I said yes. I've been wanting to film her for a long time. I set up my camera and started recording. She took off her thong and joined me in the shower. Her little tits and nice ass were on full display. I couldn't help but get a hard-on. We started playing around and before I knew it, we were fucking. The water was running down our bodies as we fucked harder and harder. It was the best shower I've ever had.