Jerk off instructions - Little stepbrother shown how to Wixxt

My younger stepbrother is having fun with himself in the shared kitchen, I bet my ass he's jerking off to my porn. Because when I joined him, he could hardly wait to thrust into me. As sweet as I am as an older sister, I naturally explained to him how to wank properly and gave him a hand myself. But with such a hot cock, I couldn't help but take it deep into my mouth and then ride it really hard. However, it wasn't so great that our parents were watching us from the garden.