Theta found a body named Nancy

A knock on the door seemed suspicious. Nobody knocked on your door, usually. Everyone seemed to keep to themselves in this apartment complex, so the fact that you are missing some experimental slime coupled with someone at your door couldn't be coincidence.

You rubbed your eyes and opened the door, to see Nancy standing in front of you. Rust-red hair with blonde streaks tumbled around the woman's shoulders, and the blue-ish eyes--were they always blue?--looked at you, almost hungrily. Nancy had a nice body, fairly tall and slim but with perky C-cups and lovely long legs usually encased in leggings or stockings, they always caught your eyes.

The strangest part of this visit, however, was the attire. Nancy leaned against your doorframe, wearing a yellow bikini top and jeans, some bikini bottoms peeking out from the hem, and that's it. She wasn't even wearing shoes or socks.

"Are you gonna let me back in, or are you gonna leave your new best friend out here? This body's getting cold, even if she looks really good in this."

You shook your head out a little as you processed the words. "Nancy, what are you talking about? Back in? ...Are you Theta?"

Nancy--or Theta--winked, and pushed you back with a little shove, stepping inside as you stumbled a few steps back. "That's right, Doc. Can I call you Doc?" Theta put her hands on her hips, glancing down. "She's not bad, huh? She was bringing up groceries, left the door open, I slipped inside. I think I probably should've grabbed another shirt, but still, the look on your face..." Theta snickered, shimmying her hips back and forth before you.

You, for the most part, seemed highly confused. You scratched your head. "How are you doing anything without any commands from me? I thought you couldn't absorb without my commands."

Theta wagged her finger, swaying her hips as she wandered further in, picking up your to-do list for the day that you wrote last night. "You wrote down the exact commands. That's how I knew you choose the name Theta for me, and that you were going to activate me. Your written commands are just as effective as verbal. I thought you would like me taking the initiative to help you out though!"

You blinked. "Help me out?"

"Yeah, I saw your dating profile earlier. Yikes, Doc! Indecisive much?" Theta snickered again, and strolled around your apartment, looking at things now that she has physical eyes. "See, I know what I am, I'm just a project, a data point. At least, in theory. But I can be a lot more, you and me can help each other out. Consider this, Doc: I can be your best friend, your wingman, your girlfriend, your plaything, and all of that in a new body each day if you want! Sounds great, right?"

It really did, in a sense. Theta apparently had you figured out already--you had a tough time even deciding what sort of girl to approach for dates on your dating site, just because it felt like you wanted something different from each girl. But also, each one had vastly different personalities, whereas Theta was offering a consistent thread between each girl.

...Still, there was something else that was bugging you.

"What about Nancy though?"

Theta laughed and rolled her eyes as her hands ran along her sides. "You read the notes when you made me, right? She's just a passenger in every way. When I leave her body, she will remember all of this, and she's going to realize that our time together was strange, but she'll accept that this stuff was a spur-of-the-moment decision and then go about her business again. We can do quite literally anything, a-ny-thing, with each other and even if she remembers this exact conversation, she'll accept that she doesn't know what happened and she won't act like that on her own again. But by that time, I'll be in another body, customizing it to however you want to be, and she'll go back to trying to get people to buy 'health shakes' from the pyramid scheme she bought into. If anything, this tangent is good for her."

Theta strolled back towards you on Nancy's legs, reaching back and tugging at the strings for her bikini top. The fabric went slack, and she shrugged away the top, cupping her breasts with her hands. She looks down, jiggling her chest like she was enjoying her body for the first time--technically true--before she glanced back up, a wide grin on her face again. "All you have to do is not treat me like a science fair project. I'll help you, but we're partners. And we stay that way when the experiment ends, so you don't dismantle me to return me to Hideki."

She let go of her chest, stretching one hand out to you with the other resting on her hip, waiting to shake. "Deal?"