Let your sister give you a hand

It's just a harmless little handjob, right? It's not like you were fucking your sister or anything. You just wanted to test your abilities a little on the closest willing participant. Well, "willing" may not be accurate, considering how she doesn't even realize what she's doing, but you choose not to complain about this gift that keeps on giving.

You cough nervously as Katie continues eating, mostly oblivious to your motions in attempting to undo your pants with her hand on you the entire time.

"Don't mind me, I'm just gonna get a little more comfortable."

Katie even assists you in pulling your pants down and fishing your cock out from your underwear, but her face is still unresponsive. When her fingers finally touch your bare cock, you discover just how gentle your sister can be. She explores your glans and the mushroom tip instead of immediately going for the "**** grip" you usually give it.

Hey, they don't call it "beating your meat" for nothing, right?

But Katie, or at least her hand, is much more patient and relaxed, even cupping your balls and rolling them between her fingers playfully. Her hand and your cock seem to have an unspoken agreement to discover what causes you the most pleasure and act on it.

"Ohh, Katie..."

"Did you see Alice today?"

Katie snaps you out of your reverie as she asks about your crush on the barista, now looking at you with a teasing glint in her eye. She liked to toy with you about admitting when you like someone, as she thought her brother being interested in girls was cute. But now, she's literally playing with your cock while she teases you.

"Well? Did you ask her out? Finally get that smooch you've been looking for? Mwah mwah mwah~"

Katie's hand grips the base of your cock and starts stroking it casually towards her face, all while jokingly making kissy noises and awaiting your response. You struggle to answer her honestly, so you blush and look away once more.

"M- Maybe."

Technically, you aren't lying. At least one part of you had been intimately acquainted with Alice's mouth. This answer seemed to energize Katie's languid strokes, her hand now moving faster and taking extra time to palm the head of your cock and smear your precum on her fingers. Smiling, she then does something you never could have expected.

Katie actually spits into her hand and lubes up your cock with her saliva, before returning to a smooth pumping motion and gliding her experienced fingers from base to tip.

"Oh yeah? Good on you, bro! I knew you had some balls, I was just waitin' for you to show me."

Your penis throbs in appreciation of her accidental innuendo, and you feel your body tensing up for another orgasm. This time, there is definitely going to be a mess. Knowing this, and how far you've already gone, you call out to your oblivious sister.

"Katie! J- Jerk me off on your face! I wanna cum on you!"

Katie had already turned back to her meal for another bite and seemingly didn't notice your request, but her body responds quickly. Her other hand drops the fork and reaches over to pull your waist as close to her face as possible. The stroking along your cock picks up pace yet again, her hand trying to get you off just as you asked. Unable to withstand your sister's amazing handjob, you succumb to the sensations in your lower body.

"Aah! I'm... cumming! Take it all on your face, Katie!"

Katie immediately swallows whatever she's chewing and opens her mouth in front of you as if to give you an extra target when painting her face. The jerking motions of your hips make it difficult to aim properly, however, considering you feel like hot lightning is coursing through you at the moment.

Katie's hand doesn't stop pumping you, only slowing down when she feels the first jet of hot cum blast over her face. She seems to know exactly what you want as she aims your penis for you in coating her cheeks and tongue in sticky globs of semen. Your mouth gapes at the sight of the facial your sister basically gave herself.

As soon as your orgasm ends, the tingling sensation in your cock falters and her hand releases you, teasing the tip one final time. You fall backwards onto the floor, exhausted yet totally satisfied with a goofy grin on your face. Holy shit. This power is amazing.

Your cock offers a minor twitch of excitement at the thoughts of what else you can do with this. Suddenly, Katie's foot once again rests itself on your groin, massaging you gently as she concernedly questions you with a load still on her tongue.

"You okay, bro? You look pretty tired. Mmn... Maybe you should go lay down or something."

Katie actually picks up her fork and stuffs another piece of scrambled egg in her mouth, rolling your cum around her tongue before swallowing both it and her food. All the while, her foot carefully teases your balls and rubs your deflating member into your stomach. It's as if her body is lording its apparent victory over you even though you believe yourself to be the clear winner in this scenario.

You sigh in satisfaction. This is a very happy birthday for you.