His thoughts, however, wouldn't let him rest. His mind was filled with the thoughts of what the last couple of weeks had brought. For one thing, he and his sister Krissy had become very close that spring and summer. Actually, that was an understatement. Krissy and he had done much more than a brother and sister ever should. But the thing was, he couldn't stop. In fact, he didn't want to stop. Even now, the thought of Krissy's full soft ass and perfect tits, her luxurious mouth and dirty mind, all had him getting semi-erect, despite his sleepiness.
Krissy had been the instigator of the whole scene. A few weeks before the end of the school year, she had become aware that Paul was in the habit of jacking off every night in the den upstairs over the garage, after he thought everyone was asleep. He would say he was working on homework if anyone questioned him about his late night use of the computer, and was careful to erase his internet tracks from the rest of the family. But one night, Krissy got up to use the bathroom, and realized that there was no toilet paper. Silently, she crept down the hall barefoot to the hall closet at the foot of the stairs leading to the den. Looking up the steps, she noticed that the door to the den was slightly ajar, and there was flickering light coming from the gap. Intrigued, she tip-toed up the steps to the door. Only a sliver was visible through the doorframe, and she moved closer and peered through. What she saw took her breath.
Paul was stretched out in the chair in front of the computer, completely naked. On the computer screen, two women, both brunette and of similar features, were eagerly stroking and sucking on a fully hard cock. With wicked smiles on their faces, they were eagerly pleading with the owner of the cock to cum for them, to let them taste his cum.
Now, Krissy had seen porn before, and even liked it. Although only eighteen, she loved sex and was easily aroused. She had tried almost everything sexual she could imagine, and liked most all of it. She especially loved giving head, loved the power and thrill she felt when she sucked and stroked a guy's cock to the point where all he could do was whimper and beg to cum. She even loved cum itself, not so much for the taste, but the heat and the sheer nastiness of it. Since she had discovered how much she loved sex, she often would hook up with a guy she thought was cute, usually after a show. When she did, as often as not, she ended up making the guy come in her mouth rather than her pussy. She kept taking her pills, though, just to be sure.
So it wasn't the sight off the porn that shocked her. And she really wasn't that surprised to see Paul, with his hand wrapped around his slick and rigid dick. In an abstract way, she had always figured that he was a normal young man, and if she had thought about it, she would have guessed that he probably enjoyed stroking himself as much as the next guy. So she wasn't surprised to have the fact confirmed.
What she wasn't ready for, though, was the immediate and complete rush of lust that ran through her body at the sight of Paul's body, fit from swim training, and sporting the most beautiful prick she had ever seen. In her rational mind, she knew that this guy she was now drooling over was her brother, the same boy who had been living in her house her whole life. Plus, she knew that it was wrong to feel this way about him. The thing was, though, she just didn't care.
Replacing all of those feelings was a hot surge in her pussy. As she continued to stare at Paul, she felt herself getting damp, and felt the nub of her clit get hard against the material of her panties. As if in a dream, she reached down between her legs, pushed the crotch of her panties aside, and began slowly but firmly stroking her clit, sliding a finger onto her wetness and then back up to stroke herself more quickly. She moaned under her breath, and quickened her pace.
As she watched, the movie on the computer progressed, as the two women, almost twins themselves, increased their urgent pleas and began to hold their mouths open in anticipation. The one on the left began to kiss the other, and then looked up into the eyes of the guy. "Go ahead" she urged, "give her all of your cum!"
"Mmmhh!" said her partner, alternating between sucking on the head of the cock and holding her mouth open and tongue out.
"That's it, go on and cum. She wants to taste it. She wants to swallow all of your cum. Cum for her. Cum for her!"
Paul was obviously getting close himself. He was stroking more firmly, not as fast but with a determined rhythm. A steady stream of clear fluid was dripping from the tip of his dick, and he began to arch his back.
