He tells the truth

"Mom, we're teenagers. It's only natural that we explore our sexuality. And who safer to explore with than our own twins."

Matt's mother stood there with her mouth open for a good five seconds before she put down her foot. "Karen. Go to your room, now."

As Karen got off Matt's bed, his mom grabbed him by the ear. "You're coming with me."

Just for a second, Matt fantasized that maybe she would take her to her bed to give him a lesson in how the female body really works. That fantasy was dispelled when she shoved him out the front door.

"What?"

"You are not my son," she announced. "Having sex with your own sister. There is no sin worse than that."

If some God thought playing sex games with his sister was worse than some of the other crimes people did, Matt didn't have a lot of respect for that God. On the other hand he clearly wasn't going to be able to argue with his mother. Maybe she'd come around in a few days. In the meantime, he had to find someplace to stay.

Well, hell. Maybe he should have come up with a lie.