"A contraceptive spell," replied Gwen. "It magically prevents pregnancy by postponing ovulation. It actually makes it possible to remain fertile much longer than normal. Charmcaster had the corner bent to bookmark it; I guess she needed it a lot."
"But what if you're already pregnant?" Ben asked.
"It says that the spell reverses the fertilization process and splits the cells back into an egg and a sperm," Gwen replied. "Not even pro-lifers can complain about that."
"Is it complex?"
"On the contrary," she said proudly. "I could do it right now."
Gwen placed a hand over her stomach and read from the book. As she read, pink magical energy appeared in her hand as the spell was cast. She finished the spell and sighed as the magic washed through her body, doing its work.
Ben sat up and looked intently at the preteen redhead. "Did it work?"
"I think so," said Gwen. "I'll have to recast it every month, but I should completely protected." Her eyes suddenly widened in surprise. She looked down and saw one of Ben's hand clasped on her right breast. She looked at him cynically. "You couldn't hold it in for another second, could you?"
Ben looked confused for a second, then saw where his hand had flown. "Oops," he said. "I guess not."
They sat silently for a few seconds before Gwen said, "Are we going to fuck again, or are you just going to manhandle my breast all night?"
Ben, not answering, quickly tackled her down and ...