Alone with his thoughts

William had almost missed it. His orgasm, the first he'd ever experienced by anything other than his own hand, had been powerful and unexpected. Having already cum twice that day, William had only anticipated fooling around with his mother, probably going to be with blue balls. Of course, things had escalated far beyond what he had thought they would, and quickly too.

"I didn't think I'd be able to do that," he managed to mumble, fighting off post-orgasm slumber brought on by the rush of dopamine. His erect penis was still inside the hot wet slit of his mother, her body straddling his, their scents intermingling, filling the air of his bedroom. Part of him wanted to go again, to see if he could possibly cum four times in a day, but that part was losing the fight. The sense of relaxation and release was growing every passing moment. It was as if his bed was slowly engulfing, pulling him into a warm embrace, lulling him to sleep.

"Well, honey, I'm glad that you could," William heard his mother say, as if from a distant room, "We've gone far too long without really bonding. I'm so happy that you invited me to your room. Now if you'll excuse me, I've got some stuff to clean out of me."

William's penis slid out of his mother and flopped against his stomach. She was glad. William was glad. His new power was amazing. The changes that had to occur to his mother's psyche for her to accept what had just happened must have been profound, but it was as if nothing had happened! She was totally okay with it! Then the rest of what she said began to sink in. Clean out of her? Clean what?

Then he thought of his sister.

"Wait!" he shot up to a sitting position, "Don't get rid of it! It's for Morgan!"

"Oh, of course it is!" William's mother said with a smile. a slightly surprised tone in her voice. She was straightening her hair as she stood up from the bed, "Oops! A little is leaking out!"

William watched as his mother reached between her legs and began to scoop the cum into her hand that was running down her leg. Then she reached into her vagina and tried to coax what was left out as well. She looked around the room and saw an empty drinking glass beside William's bed.

"Do you mind?" William heard her ask, indicating the glass with a jerk of her head.

He didn't respond verbally, but instead just handed her the empty glass, which she immediately started using to collect every drop of semen she could collect. Among the sights William saw that day that he would never had believed the day before, this one topped them all.

After a minute, he watched her straighten and inspect the glass. With a nod of satisfaction, she turned toward the door.

"I'll just change then bring this to her. I wonder what she'll use it for," He heard her say as she reached for the handle.

"No, wait," William blurted, realizing what was about to happen. If Morgan was handed a glass of cum, it would all be over. "It's a surprise. Give it to her mixed in with something. You have to trick her into drinking it. Don't let on what it is!"

"Oh how fun!" William's mother giggled, "I love practical jokes! She'll never see it coming!" Then she continued out the door, leaving William alone with his thoughts.

What was his endgame here? Once he didn't have the eye candy of his mother in lingerie to distract him, William began to fall into the trap of wondering what he was trying to achieve. He hadn't planned on having sex with his mother. He had just planned on seeing how far he could take things, maybe messing around a bit, giving himself some wank material. The problem was that it was just too easy! Before he could even consider what was happening, the combination of his mother's willingness and his own hormones kicked in and left his mother impaled on his cock.

And he could see it happening again.

And now he'd sent his mother to turn his sister into his **** as well!

William closed his eyes and took a deep breath, trying to get his thoughts straight, trying to decide what it was that he wanted. Obviously having his sister under his thrall would come in handy. He needed to have a way to have her not suspicious of his mother's actions. If he had the ability to tell her not to notice anything, all his problems would vanish. But is that all he wanted? Did he want to take things as far as he had with his mother? William wasn't sure. The relationship he had with his mother had been distant, but not negative. His sister, however, had always been a bit mean to him. They were close in age, but had never become friends. Maybe with his new power they could become closer. Maybe he could push her just enough to not be a problem, but be a bit more fun. Maybe he would be able to control himself, stop himself before it got too far.

Maybe...