So naughty having your stepsis suck cock

You're hosting a costume party with all your friends and invited your stepsister Princess Ellie Idol over too. She's standing next to you, taking in the fun dressed up as Scarlet Witch... and you can't stop looking at her. There's a stirring down below and you find yourself getting a boner over her. How mortifying! You can turn and face the room and let all your friends see or let your stepsister be the one to take notice. Either decision is going to be difficult here!! Luckily, your stepsis is cool about it and decides she can help!