"Dad!" Jeff heard the voice of Lucy, his 13 y.o. sister. Michelle felt a strange familiarity in Lucy's voice, as if she heard it before, calling for her. Jeff removed his face from her lap and got up the sofa quickly to stop his sister from coming down, since he didn't want to explain to her why there was a girl wearing the same outfit as their dad, or how he got a girlfriend.
Jeff's sister, Lucy, had long curly brown hair, a feature she inherited from her mother, while she had the dark blue eyes of her father, Mike. Her eyebrows were somewhat bushy, and she had a Greek nose. She was taller than Jeff at her age, standing at 5'4", not so far from her brother's height as a 16 y. o., 5'8". She wasn't very toned in terms of muscle, but she didn't have a lot of fat either. Her cup size was the same as Michelle, a B-cup, but Lucy lacked the trained body of her brother's girlfriend.
"Lucy, what do you want?" Jeff asked.
"I need to talk to Dad, Jeff, move it."
"He's..." Jeff tried to come up with an excuse, "...sleeping on the couch. You shouldn't bother him."
"He fell asleep watching one of his sport games?" Lucy doubted. Of course she would doubt it. Dad always watches his games until the end.
"Yeah, you know. It was an awfully boring game. Not even he could endure it."
Lucy stood there for a couple of seconds, staring at Jeff, who couldn't look more suspicious. He was stuttering, his hands were shaking, and he was blushing. He had to be hiding something, and she was going to find out. Lucy tried to get to the living room, only to be grabbed by Jeff.
"Jeff, let go! I need to talk to Dad about something important!"
"What's so important that you have to wake him up?!"
"It's not your problem!"
As the two siblings squabbled, Michelle got up from the sofa too, walking towards the stairs, where Lucy and Jeff were. "Are you two fighting again?" Michelle said.
"Again?" Jeff thought. "What does she mean by again? She has nev-"
"Who are you?" asked Lucy immediately, interrupting Jeff's inner thoughts. Michelle, meanwhile, found the question strange. "I'm Michelle, don't you remember Lucy? Your brother's girlfriend? I've come here many times."
Lucy was almost sure that Jeff didn't have a girlfriend, or at least she never suspected he had one, and certainly no girl came to their house claiming to be his brother's girlfriend. And, wasn't her Dad the one watching the TV on the living room? A bunch of questions went through her head, and while organizing her thoughts, Lucy came to the conclusion that Jeff must have done something, judging by his attempt at stopping her from looking for their father. "Jeff," she looked at her brother, "What did you do?"
Convincing his sister that Jeff managed to conceal the only girlfriend he ever had wasn't the most complicated thing here. What put him in a tight spot was when Michelle said that she had been in their house on reiterated occasions, enough to have met Lucy. Did the mental changes of the transformation made her believe that? Jeff couldn't handle the pressure, so he...