She leaves..But you're in for a surprise

Taking a quick few glances at the door,you wait a few moments to make sure you hear your sister's footsteps recede.

"Phew! She just, HAD to come in,just as I was checking out my junk."

Drawing the back of your hand across your forehead, you wipe off the non-existent beads of sweat.

Back to the matter at hand.

Your cock is still generously swollen now. Long snake-like veins are running along its length. It takes both of your hands to wrap around its girthy circumference.

"God, look at it go..."

As your hands fondle its length, it bucks and throbs in time with your firm ministrations. Long pearls of white essence gush from your enlarged piss hole, coating your cock,hands and balls with its sticky texture.

Like it knows that your enthralled with its magnificence, it stands ramrod straight, almost touching above your belly button with its size.

Maybe due to the abundance of fleshy veins, but even the slightest touch sends shivers down your spine and into your golf-sized balls.

"Shit!"

Too overcome by the pleasurable feeling, you can't help but notice the absurd amount of pre-cum that's bubbling from your flesh-tap. It's starting to make a mess of your carpet.

"Maybe I should've laid down some glad wrap or something...Maybe a few t-shirts?"

Mumbling to yourself with eyes closed, you know it's a forgone conclusion that you've cast aside the thought of stopping.

As you build to crescendo, you can't help but hear, footsteps leading to your bedroom. You pause for a few seconds before resuming.

"Was it a trick of the imagination?"

You can't help justifying in your mind, that what you just heard is nothing to worry about. You clear your head of distracting thoughts.

Too bad for you, you should've listened.

*Knock knock*

"Honey, it's me mom. Is it alright if I come in?"

You're too far gone to pay attention to a stupid distraction, you're almost there.

Ever so slowly, the door swings open. Now you've realised that someone was there. Turning, you're just in time to see your mom walking in, while you're stroking your cock in rythm with her footsteps.

Both gaping, you at her heavy tits almost spilling out of her barely-there lingerie and string thong. To you, with a lubed up cock, angrily protesting about its **** that's pointing straight at her.