No!

The door opens, and your older sister Amanda walks in just in time to catch the first rope of cum directly across her stunned face.

"Oh fuuuck," you groan as your whole body arches up, ecstasy blotting everything out as your hips jerk, fist pumping more and more or your warm seed out in rope after rope, the relief of the rapidly dissipating pressure feeling almost as good as the simple, pure ecstasy that rushes through you like a lightning bolt.

"What the fuck?" Amanda yelps, quickly backing up and tripping over her own feet. Her back hits the doorframe, and she catches herself so that she only falls onto her butt, staring eye-level at your cock as it continues to paint the floor and sheets around you white.

What feels like minutes later, but is actually just a handful of seconds, your whole body relaxes, muscles going limp as you take a deep, shuddering breath. Your cock is still twitching, the last few bursts of cum spurting out in smaller and smaller splashes, until the warm seed just oozes down over your hand.

Your heart is pounds in your ears, and you feel yourself floating through a warm, pleasurable haze... but the haze doesn't take long to disperse, and just a few breaths later your mind feels clearer than it has been in years.

Leaving you staring with growing horror into your sister's wide, staring eyes.

Oh fuuuck...