Your adopted sister, Jia

You barely had enough time to hastily pull your bed sheet back over your near-naked body before the door opened a crack and you see a familiar face smiling in at you. "Happy Birthday Big Brother!"

Your sister, Jia, quietly opened the door far enough to slip inside and then closed it behind her as softly as she could. The eighteen-year-old was originally from China but had been adopted by your parents when you were ten. Jia and your birth sister were both two years younger than you and the three of you had grown up together as close siblings. When you reached High School, however, Jia found herself drawn into the more popular cliques at school, and spent much less time with her siblings than with her new friends.

Part of her newfound popularity may have caused by the fact that she had developed into quite a hottie in her later teen years. You had found it quite uncomfortable when your adopted sister had grown curves in all the right places but still treated you like one of her best friends, including walking around the house in her skimpy casual outfits. She was only 5 foot tall, but had developed DD's that looked huge on her small frame, with a yoga-toned ass that just begged to be squeezed. Along with her flawless skin, dark, alluring almond-shaped eyes and full pouty lips, your little sister had grown into a full fledged beauty, drawing admiring glances from every male (and some of the females) in your school.

You hadn't been immune to Jia's beauty either, and she'd used it a few times to get you to perform a few favors for her. Every time that she'd given you a hug or looked over your shoulder, letting her soft breasts press against your back, you'd gone hard in your pants. When you'd discovered a pornstar named Jade Kush, that was a dead-ringer for Jia, you tracked down every clip you could of the starlet and spent countless nights "enjoying" them.

Your cock was already hard under your bed sheet as you looked to Jia entering your room and you realized that she was wearing an outfit that you'd never seen her wear before. You also couldn't remember the last time that she'd visited your room and knew that she hadn't snuck into your room at night since before you were teens.

Jia was wearing very little, with a pair of pink panties that tied at the hips, like a string bikini, and a matching tubetop that had a large heart-shaped hole in front, showing off her plump cleavage. You couldn't remember ever seeing her in any thing so skimpy, aside from her bathing suits, and your cock twitched against your stomach at the sight.

"I saw your light was on from under your door," she said quietly as she moved toward your bed. "You must be excited to unwrap your presents, aren't you?"

"My presents...?" As you were trying to put together what your birthday might have to do with Jia giving you this early morning visit, she climbed up onto your bed, crawling closer to you as she gave you a seductive smile.

"Yes, Silly," she said with a soft purr in her voice. "The present that I've been promising you for months. I even bought this outfit to make the occasion more special." As she said this she moved over your midriff, straddling you with a knee on either side of you as she ran her fingers up her toned thighs and then along her torso. "You like it, don't you?"

You couldn't even look Jia in the eyes as you admired the outfit and the way it hugged her gorgeous body. Her barely covered form was a mere foot from your face as you drank in every inch of her with your eyes and nodded. "I do."

It was hard to collect your thoughts with all your blood surging toward your monster cock, but you knew that something in this universe was very different from your own, since your version of Jia had never treated you as anything other than a friend and brother. Was your well hung, muscle bound body the thing that could cause such a difference in her behavior?

As if in answer to your unasked question, Jia reached down and ran her finger tips along the visible bulge running along your sheet. With a giggle, she said, "It sure feels like you're enjoying my outfit." Her hips gyrated slightly as she caressed the thick cock bulge lovingly. "So unfair that the biggest cock I've ever seen belongs to my big brother." She wrapped her dainty fingers around your cock as far as she could reach, pulling the sheet tight around it your shaft as she gives it a stroke. "If we weren't related, I'd be telling all my friends about this monster." Her hips rolled in time with her slow strokes as she looked into your eyes, asking, "Are you ready for your present, Peter?"