Barbie got up out of her chair and walked over to Tammy. Tammy was a couple of inches taller than Barbie, but she usually appeared to be more so due to the shoes Tammy favored. Barbie wasn't sure she liked that Tammy was taller even without shoes as she was now, but Barbie could fix that later if she liked, and she snickered at the thought.
Barbie waved her hands in front of Tammy's face. Tammy looked irritated, but did nothing, like there was something on the tip of her tongue she just couldn't bring herself to say. Barbie circled around Tammy a couple of times; as much fun as she was having, the thought of Tammy snapping out of it kept Barbie a little on edge. As a bit of a test, she slapped Tammy's ass, and jumped back away from her.
Slapping Tammy's ass proved two things, the first of which being that Tammy was definitely wearing a thong. The second was that Tammy was truly unable to act against Barbie, as Tammy just stood there and did nothing.
Barbie, like a giggling school girl, made her way to the front of Tammy, and told her to raise her arms. Barbie reached down to Tammy's waist and lifted up her loose shirt. Standing on the tips of her toes, Barbie lifted the shirt off of Tammy. Barbie laughed at Tammy's super-loose bra, then told Tammy to undo and remove it.
Tammy, blushing red from both embarrassment and anger, removed the bra and dropped it unceremoniously to the floor. Her breasts were little more than the nipples on top of them.
Barbie thought the power of this was exciting, but found it a little lacking due to Tammy being her sister, and Barbie wasn't all that attracted to girls. It was then that Barbie realized she could get more out of the program if she found more people attractive, and reluctantly decided to try the program out on herself.
Keeping the changes to Tammy saved, she loaded up her own form. It was weird seeing herself on screen, but she regained her focus after a moment. There were plenty of things she'd like to change about herself at one point or another, but for now, she checked her sexual preference from "hetero" to "bisexual".
She was about to apply the change when she noticed a slider for her sex drive. It seemed low to her, and after a moment's hesitation, she decided she may as well increase that, too. After sliding her sex drive to about twice what it was before, she hit save.
Barbie shuddered as a rush ran through her. She felt as though she had been given some sort of stimulant, and just about everything touching her felt sensual, even the clothes against her skin. She felt compelled to rub the fabric of her shirt, and as she did so, she noticed her own breasts in a way that had never occurred to her before.
Barbie was excited, but also a little scared; she had changed something about herself drastically, and she wasn't ready to change more about herself in spite of desperately feeling the need to do more with the program. She turned and saw Tammy in a whole new light, and brought her sister back up on the screen...