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Gwen raised her eyebrows. Just when Ben thought that she was about to get angry, she smiled and said:

"Thought you never ask."

She placed the book aside, then snapped her fingers. The two of them were enveloped in purple light, and when the light disappeared, Ben found that he and Gwen were already in her bedroom, completely nude.

Ben was horrified. He wanted to say that he was joking, but then Gwen might blast his head away with her spells. Or did something worse, like blasting his lower head away with her spells.

"Are... are you sure? Have you considered that we shouldn't do this for... some reason? Like... Kevin would mind if his girlfriend cheated on him?"

"Oh, don't mention that car maniac to me. He spends all his time to make his car bomb-proof, acid-proof, everything-proof. If he needs to protect something from harm, shouldn't his priority be his **** girlfriend?"

Ben thought that "****" shouldn't be used to describe a walking magical nuclear power plant like Gwen, but he was smart enough to not say that aloud. Instead, he said: "You do not need to **** yourself. I mean, you don't have to do this with a man you don't love..."

Gwen pulled Ben over and pressed her chest on his while placing a long, deep, loving kiss on his lips.

Words weren't needed anymore. They brought each other to the bed. Gwen’s legs splayed open, welcoming Ben's cock to explore her birth carnal.

Ben crawled into his mating position. He was surprised at the ease at which the initial insertion was made. After his cock fully entered her, he began to move in and out, faster after each cycle.

Gwen unconsciously gasped as the pleasure was so intense. She raised her hips to ease the invasion. The emptiness in her lower abdomen was now filled with the insertion of Ben’s thrusts. She now had become a total **** to her carnal desire. Her body tightened as she awaited Ben’s final release. She could feel that her cervix was opening, leaving her womb completely defenseless. Now all it took to make her a mother was a single dose of Ben's little swimmers.

After a minute or two, Ben felt that he wouldn't last much longer. Judging from Gwen's expression, she fully intended to let him creampie her, and Ben seriously doubted that she was on any kind of birth control. He asked himself: Impregnating a strange woman is one thing, but your own sister?

He decided that he wasn't ready for that, so when the time came, he pulled out. However, when the cum began to spray on her tits, Gwen suddenly came back to her sense.

"No, don't waste your seeds like that! Let me take them all!"

With a movement of her finger, Ben's cocked was pulled back into her pussy. Suddenly his cock was being assaulted by Gwen’s spastic velvet vaginal contractions. His charging hips propelled his cock into the deepest part of her vagina and fired copious quantities of semen deep within her sexual gut. His mind was as clear as a blank paper, and his instinct took control over his body, trying its best to impregnate the woman in front of him,

Gwen was no better. The flood of hot thick semen sprayed All of the nerves in her uterus were stimulated, triggering a tremendous orgasm. Her eyes rolled over, her tongue extended out and saliva dropped from her mouth. In short, she made a facial expression called "ahegao".

The aftershocks of his orgasm receded to mild tremors. Ben slowly pulled his cock out of Gwen. An enormous backflow poured out of her vagina, yet her abdomen showed little to no deflation.

After a brief period of silence, Gwen smiled and said: "You should do this to me long ago."

Ben couldn't say that since a day ago, **** was still taboo for him: "I... I'm afraid that you will hate me."

"Hate you? No way! It's true that we had some quarrels while we were children, but I always love you. I dreamed many times that on your 18th birthday, you would confess to me, carrying me to this room and unloading a dozen times inside me until I become heavy with your child.”

Ben: "I have never felt such an intense orgasm as I did just then. I felt it over and over and over. It is the best sex I’ve ever had.”

"Me too. You almost made me lose control of my magic. If I hadn't trained that much recently, anything within four blocks would have become a mess."

Ben looked around, “I think we have already made a big mess.”

“I can wash these sheets. Or just clean it with magic,” Gwen replied. “If I let you rest awhile can we do it again?”

With a sly grin, Ben said, “Maybe so, after all, I think our bodies are supposed to become mutually compatible. But are you sure you want to have sex again? The more we do it, the more likely you'll have to graduate with a big belly.”

"Oh, I know a perfect contraceptive spell, as well as a spell that guarantees the pregnancy. But I think I'll leave it to nature this time. If it happens, I will tell everyone in my graduation speech that my younger brother had bred me."