Big stepSis Movie Night - No Blue Balls

You're home alone, just you and your step-sis. Its movie night, and she's laying in the bed with you, wearing a tiny top and shorts. She keeps smiling at you.. is she.. flirting? She can't be. Its your step-sister! But you can't help it, that ache in your pants at the sight of her.
She notices you're being shy and looks down and see's your boner. You are SO embarrassed. But she doesn't seem to mind, she knows it must be super uncomfy. She doesn't want you to get blue balls so she encourages you to take it out and stroke. Then you two will be able to enjoy the movie since you'll be relaxed.
Reluctantly you take your cock out and she actually really likes it. It's making her horny. She says to promise you won't tell step-mom and step-dad? She leans over and takes your cock, lets her spit drip on it and strokes it for you. She finally takes her tits out and wonders if you want to cum on them? She'd really like that, she's noticed you're always looking at them. She lets her spit drool on your cock again and tells you to keep stroking for her.
Your cock is making her super horny, she really wants you to cum on her big tits. You blow your load ALL over her tits and she LOVES it. Your big step-sis really DOES care about you, she'd never want your balls to full of all that cum XO
Tags: taboo, step-sister, step-brother step-sister roleplay, POV, virtual sex, cum on tits, cum fetish, handjobs, masturbation encouragement, big tits, lingerie, Harley Sin