Fellatus Interruptus

You settle into a comfy routine. You find yourself a part-time job and spend most of your evenings at home. Life is pretty normal, if normal can include two siblings regularly giving each other oral. Which brings us to this particular afternoon.

You just got home from an especially exhausting shift and flopped down on the couch, intending to take a quick nap... or maybe a long nap. You sense your sister's presence before you feel her hands, her fingers running along the skin of your arm. You open one eye and glance down.

"Hi," you say.

"Hi," she replies. "Feeling worn out?"

You nod and let your eyelids fall shut again.

"I just need to rest for a bit," you mumble.

"That lump in your pants doesn't look like it wants to rest," she teases.

You feel a slight pressure against your bulge and you squirm. Your cock throbs in response.

"Yeah, well, it wasn't like that before you-OW!"

She pinches your arm, hard. "I keep telling you, don't perv on your sister, dude! I'm just keeping to the deal. Don't read anything else into it."

You rub the sore spot. "Ouch, sorry. I was just joking."

Most of the circus she'd put on at the beginning had fallen by the wayside in the past few days. The justifying explanations, the distracting porn show, the veil blocking your eyes from her act, all of it was gradually dropped for being too much bother. The porn show especially had to go, after the 'Step-bro' incident. A more efficient approach was needed. Now, Jan was simply kneeling between your legs and servicing you without a fuss.

Just so long as you kept your mouth shut and didn't draw attention to what you both knew was really going on, Jan could keep pretending it was all just business.

"Just think of anime or whatever," she says, unzipping your fly. "And if I catch you staring at me while I do this, I'll bite it off. Got it?"

You nod and lean back against the sofa. Jan's hand snakes its way into your boxers and fishes out your cock. It's gone floppy from the shock, but your sister's touch revives it quickly. She strokes you slowly, squeezing and caressing, while her tongue flicks across the tip.

In your mind's eye, you conjure a scene in place of the one denied to your vision. Your sister's soft lips are wrapped around your dick and her head is bobbing up and down. You feel her tongue sliding across the sensitive underside of your cock and a shudder of pleasure runs through you. In your imagination, she's completely naked, her perfect, perky tits jiggling with each movement.

Jan's fingers brush against the base of your shaft and you groan. Her touch is so light and delicate, yet it drives you wild.

"God, I want you so bad," you murmur.

She stops and glares up at you. You feel teeth graze your root.

"Oh, I was, uh, thinking about a girl I saw in Hustler once," you cover with a quick lie.

Jan's mouth returns to its task and she gives your shaft a slow, firm draw, causing another groan to escape from your throat. A different fantasy takes shape in your head. Instead of going down on you, your sister is straddling your cock and riding it up and down. Her perfect breasts bounce in front of your eyes and her hair brushes against your face.

You grab her hips and pull her down, thrusting up into her. She moans and leans forward, kissing you passionately. Her tongue explores your mouth as her pussy squeezes around your cock. The kiss goes on and on and you never want it to end.

Then the doorbell chimes.

"Aw fuck," you groan.