Even with the door closed Tyler couldn't concentrate. He struggled to focus as he bent over the microscope, peering down the barrel at the sample he took from the back of his own neck, struggling to see if there was anything he could go off of, and struggling to ignore the pressure growing in the back of his mind. The heat of the late afternoon suns streaming in through the closed windows made the house uncomfortably hot, and his t-shirt was damp and limp with sweat. Where it clung it seemed to make his skin tingle, but where it fell free the gentle breeze seemed to electrify him. Something in the back of his mind whispered to him, bringing up pictures of his gorgeous sister and drawing him into daydreams. His shorts were tented for sure, his cock hard and dripping with the thought of his sister Jessica's sweet, tight hole, and the way her vaginal muscles rippled in orgasm as he slammed in deep...
He forced his mind away with a visible effort, shaking his head and pressing his eye once again to the eyepiece. Feeling the sweat drip from his floppy dark hair and down the back of his neck, he tried once more to puzzle out the mystery of his new tattoo. It was a mesmerizing twist of branches small and large that originated from the back of his neck and undulated down across his broad chest and across his thin, defined stomach to disappear into his basketball shorts. It was dotted all over with beautiful little white flowers, each the size of his thumbnail. They sprouted randomly from all branches, their 5 white petals gently traced with thin veins and their small stamens pointed like thorns. But the back of his neck held the design that worried him the most.
The large purple flower blooming at the base of his neck was large only compared to the white flowers. It was, in fact, only the size of a golf ball, but it spread its petals wide across his skin, its stamen missing but its filaments coated in a thick yellow pollen. The base of the flower was white, and the delicate veins traced in a slightly metallic sheen of purple. It looked almost alive it was so well done, but Tyler knew it was no man-made device. The sample he looked at even now just confirmed his suspicions.
The scraping of cells from the back of his neck should have had some combination of hair and his own skin cells and colorant from the tattoo, or some other trace of its design. But it seemed to just have his skin and hair. There was no pigment or dye or any trace of anything except his plain skin. It was frustrating, puzzling, and a little alarming to think that this thing had literally grown across his skin and seemed to leave no trace of itself on him. It looked exactly like the samples he had looked at of his sister, Jessica... and even thinking of her name set his heart racing again.
That voice in the back of his mind was growing stronger by the minute, and he was losing the fight against it. The image of her face as she clamped her legs around his waist and pulled him deep into her flashed to mind and he started to pant. His cock was drooling now, leaving a wet spot on his basketball shorts, and he grabbed the edge of the table as a wave of dizziness swept over him, leaving him fuzzy minded and hot. He blinked a little unevenly, his groin almost on fire with the need, and he could just smell that musky, floral scent that Jess had been giving off ever since she came back from the woods those weeks ago with that fresh tattoo across her stomach.