19F Watching my sister get throat fucked

So as I drove home, I pulled up my security camera on my phone. My sister Sharol (18F) and her boyfriend Matt (19M) are making out on the sofa in the living room. I’m trying to drive while watching and almost ran a light. I pulled over into a parking lot and I couldn’t believe my eyes.

Sharol pulled her shirt over her head and her huge braless boobs pop out and Matt is massaging and kissing them. He stands up and Sharol pulls down his shorts and to my shock, he has this big hard cock and Sharol takes the whole thing in her mouth.

Matt is tall and slim and his cock is long and slim. Not a big thick cock but it’s long, and rock hard curving up slightly. Sharol is sucking his cock and then pulls it out and slowly strokes it while grinning at him. I always thought of him as just some skinny guy, but he has a beautiful cock. At this point I have my hand between my legs and I’m strangely enough getting wet down there.

Sharol has her hands on Matt’s skinny ass and he has her by the back of her head and is pumping away at her mouth. He pulls his long cock out and squirts big shots of cum on her boobs. I don’t know, but it must have been 5-6 streams and he just kept squirting. She laughs and rubs the cum on her chest and then she takes his cock back in her mouth and works his cock back and forth a little more. She takes her t-shirt and wipes away the cum from her chest and he’s still dripping as she cleans him up.

As I collect myself and start to drive home, two thoughts come to mind. First, I’ve got to tell Sharol to get on birth control. Second, I’d love to suck Matt’s long cock. What a puzzling, shocking event.