Matt comes up with a lie

His mother charged into Matt's room without knocking.

During the few seconds of warning they'd had, though, Matt and Karen had pulled up their clothes and were, at least technically, decent, although Karen did have a few globs of cum in her hair.

"What the heck are you kids up to," Matt's mom demanded.

He looked at her with, what he hoped was his best innocent face. "Uh, Karen and I were arguing about who had to do the biology project. We sort of got into a fight."

She shook her head. "You're almost adults. You can't keep fighting like you're children."

Speaking of almost adults, Matt was surprised to see his mother looked pretty good. She wore a short nighty that was not quite sheer but certainly close enough to transparent for him to see her nipples. And the panties looked a little damp, like maybe she hadn't been completely asleep when she'd heard Karen's scream but had been taking care of her own business. Their father was out of town on "business" again, so she certainly hadn't had him to help.

"Sorry mom," Karen said. "Mostly we're getting along pretty well. It was just that one project thing. You know, when Matt pretends he can't draw so I have to do all the work."

"That's not what I said at all." Matt pretended to be offended. "I said I would handle the technical parts if you'd handle the artistic--"

"Implying that, because I'm a girl I can't do real science."

"Oh, you two." His mother laughed. "When I heard Karen scream, I was afraid someone had broken into our house and was, well, causing trouble. Now Karen, go to your own room and Matt, try to get some sleep. Men who go out on dates on school nights have got to make sure they behave when they get home if they don't want to be grounded."

"Hey mom," Karen said.

"Yes, honey."

"That's a really hot nighty. Can I borrow it for a slumber party with Amy?"

"You are so naughty." Their mom covered her breasts with her arms but did nothing to hide the nearly transparent panties that showed just a little bit of a camel-toe. "Now get to bed."

"Night, mom." Karen got up and kissed their mom on the forehead. Then she turned back and kissed Matt on the lips... but quickly. "Night, Matt. And thanks for your help with all of the studies."

"That's more like it," their mother said.