Twincest is wincest

Laura vaguely recalled her mother once telling her that she had a twin brother -- though she supposed he'd be a sister now? She might be able to come up with something to get help from her.

After a minute or two of brainstorming, Laura came up with a series of rules she thought would work:

• Twins usually have their first taste of semen from each other.
• Twins easily become addicted to each other's semen – not so much that they’re completely nonfunctional without it, but enough that they usually spend their whole lives together.
• Twins that have become addicted to each other’s semen often develop a sexual relationship.

And two more for fun and safety:

• Semen can be absorbed through the skin, vaginal membrane, or anal membrane for nutritional value.
• The offspring of incestuous relationships are at no greater risk of genetic disorders.

Confirming the changes, Laura's vision briefly goes black -- almost like a very long blink -- before returning to a view of her mostly-unchanged bedroom. There were a few more articles of clothing scattered about (and Laura was pretty sure that thong wasn't hers), and there were a few more personal effects on the shelves and dressers that she didn't recognize, but it was otherwise pretty much identical.

Laura was pulled out of her reverie by the sound of the front door opening and closing.

"Laura, I'm home!" called a voice that Laura somehow recognized as belonging to her twin sister Samantha (Sam to her friends, but only family got to call her Sammy, her mind additionally supplied). Shortly, she appeared in the doorway of their (apparently shared) bedroom.

They may have been twins, but they definitely weren't identical. Sam's hair was straight, strawberry-blond, and usually kept in braids down her back, while Laura had golden locks that curled at the ends and hung loose. Sam was shorter and younger, but was still the "big" sister for three reasons -- 42 DD breasts and a 10-inch dick, compared to Laura's 34-C's and 7-incher.

Sam was wearing pretty typical attire, for her: a baggy, dark green hoodie and a black skirt that went to the middle of her calf. ("Why do you always wear such baggy clothes?" Laura recalled asking her once. "So no one can tell when I strap vibes to myself," Sam had replied with a perverted grin.) Her underwear, if she was even wearing any, was probably super racy.

"Hey, sis," Sam said, "I'm gonna shower, and then we can have dinner, OK?"

"O-oh, OK," Laura replied, unable to keep the disappointment from her voice.

Sam noticed, though, and then caught sight of the tent her sister was pitching. "Or maybe you'd rather eat now?" she said, seductively licking her lips.