Go see your sister

As Mark recovered from his orgasm, he noticed two things: One, that despite the length of his cock, he had still cum a standard amount, which he should rectify. More important was the second one: that Jill, his sister, hadn't seemed in the least bit perturbed by the sight of his 12 inch cock. Since Mark had somewhat of a bad habit of not closing his door when he thought no-one was home, she had gotten an eyeful of Mark more than once, so she would definitely know that Mark wasn't that big. This confirmed for Mark that the awareness settings really did work, which he shouldn't really have been surprised by.

Jill was a year younger than Mark, and was attending the same university as Mark, though unlike him, she actually attended most of her classes. Jill had what might be described as a waifish figure, with no real tits or ass to speak of. Jill often bemoaned this as the reason that she couldn't get a boyfriend. She had gotten her black hair cut short last year in what Mark thought she called a wolf cut, though he hadn't really been paying attention.

After a few minutes had past, Mark put on his underwear and a pair of gray sweatpants which didn't do much in hiding the bulge of his newly acquired cock, and made made his way to his sister's room, and knocked in the door.

"Come in"

Mark opened the door to Jill's room. The room itself was quite plain, with nothing really personalizing it, aside from the bookshelf which held her quite impressive collection. Mark walked over to Jill, who was sitting at her desk; she seemed to be typing out an essay for one of her college classes. Mark was acutely aware of the bulge of his 12 inch rod and tried his best not to think about it, and cleared his throat, Jill turning around, turning her head up towards him

"Um, S-Sorry about you, uh, seeing, um y'know, that"

"Its fine, just close your door next time, would you"

With that Jill turned back around and began typing again, though her gaze did pass over Mark's crotch, there was no sign of any recognition that something had changed. Mark took that to mean that she really did think he'd always had a 12 incher.

Seeing his sister be so calm about what had happened made him appreciate how lucky he was that she was his sister, and this got him to thinking. "Should I give her some tits and ass so that she could find a boyfriend, or maybe I should show her Master PC instead. If I show her, I should do it before I change her, somehow I don't think she'd appreciate me giving her huge tits without her knowing"