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Once the protein shake was mixed, you carried it out of the kitchen.

"I'll just pop into the other room and be back with your...medicine soon," you said, giving your sister a goofy smile to lessen the awkwardness of the moment. She smiled, threw her arms around your neck, and leaned into the second big hug since she'd arrived.

"You're the best brother ever. Now, hurry, I want your cum inside me!" Her voice had turned husky and demanding, and you were reasonably certain that she had started to curl a leg around you before she recoiled, horrified again at her behavior. "I... It's happening again."

"And it'll keep happening until we get you a dose. I'm just glad we caught you in the beginning of stage one withdrawal, before it went too far," you said reassuringly, adding, Before you went to someone else, silently to yourself. As Jen relaxed her hold around your neck and withdrew her perky body, you turned quickly toward the bedroom to hide your raging hardon. "I'll be back in a few minutes," you added, shutting the bedroom door behind you.

Turning to your computer, you opened up the network drive on which you kept only a few hundred gigabytes of porn. It wasn't much compared to some, but as a licensed ejaculate provider, you needed to keep a variety on hand to get up and off quickly. You hit the master playlist and then the random button, skipping anything that didn't immediately make your knob twitch. Redhead, twins, lesbian threesome, redhead, brunette, bondage, brunette, masturbation, gang bang: nothing seemed to catch your eye until you came across a young blonde with large breasts, much like someone sitting in the other room.

You let the video play, fondling yourself as the girl stripped and ran her hands up and down her smooth skin. It was definitely arousing, but you were looking for a faster fix, and started skipping around again. Sometime after the third video of a blonde had brought you nearly but not quite fully rigid, you had a new idea.

Closing the video player, you fired up a browser and went to Facebook. Once there, you searched for your sister's page and opened her photo album. Christmas, selfies, sorority party, black-and-white shots of buildings, dorm room, more selfies, and...here was the stuff: spring break. You had remembered her trip to Cancun and that swimsuit she wore in so many of the photos. A red number that brought out the strawberry in her blonde hair. For a one-piece, it was awfully revealing, showing a generous helping of cleavage in one picture and running like a small ribbon through her luscious ass in another.

You settled on one of the photos, with Jen standing in the sun dappled ocean, looking over her shoulder at the camera with a smoldering look. Surely, she was joking with one of her friends, but it was easy to imagine her making that face at you. Imagine her calling you over, through the surf. Imagine sliding against her wet body and tucking your hand between the taught material and her tight stomach. Imagine pulling your hard cock out of your shorts and sliding it up and down between her ass cheeks. Imagine her turning her head to kiss you, your tongues frolicking and caressing.