Absolute taboo!!! Made my stepbrother cum!

When I wanted to take a shower today, I saw my stepbrother's room through the crack in the door, the bastard jerking his cock! I'm sure he's always sniffing my panties, because they've been disappearing lately! But what I saw there made me extremely horny! A nice hard cock! Breaking a taboo!!! But hey what our parents don't see... I opened the door walked up to him and just took his cock and started jerking off!! He was stunned, but he liked it because his balls exploded and the cream spurted out of his cock! When our stuffy parents find out! Oh my gosh! How do you think they will react?