Booty Calls

*Bing bong*
I briefly turn my head from the desk. "Come in, Evelynn! It's open!"

The doorbell was my cue to move, so I quickly finished off what I was doing and closed my laptop. Pushing my chair back from my desk, I got up and started for the open door that led to the main room of my apartment. Some people would have called my place small and cheap, but the one-bedroom and kitchen/living-room deal was more than enough for me, and a bargain to boot.
[Could fill in more detail on the apartment here]

"Jacob!", she squealed as she moved in for a hug. Evelynn Andrews. My girlfriend Evelynn. It was a thought I still had every time I saw her. We had only known each other for a few weeks before we realised we clicked and she asked me out. That was two months ago, and being with her was always a joy.

As our hug broke apart, I was able to get a better look at her.
[Physical description: hair, eyes, etc.]
The only part of her outfit I could really see was a long, knee-length overcoat. The coat was tailored a bit strangely to my eyes; it did an almost supernatural job of accentuating her lower curves. Her waist seemed thinner than I thought it was, and there must have been some extra padding around the hips to make them seem fuller. It really looked like her body had changed shape. I supposed I still wasn’t really used to the sight of her.

"Hmm, you see something interesting?" She cooed as she booped my nose, startling me out of my thoughts. Guess I had confusion written on my face.
"I think your outfit's playing tricks on me, if I couldn't see your face I might not have recognised you."
She giggled at that. "Wow, it's really that noticeable? That's crazy! And here I was worrying that you were gonna be underwhelmed."

That was a weird reaction. And-- wait, what does she mean 'underwhelmed'.
She hadn't stopped talking though. She took a few steps back and started unbuttoning her coat as she continued: "Which is to say, I've got a little surprise for you. And it's not just a fancy outfit!"

With that, she let the coat fall to the floor, and I was stunned at the sight it had been hiding. She had changed, but not exactly as it had looked. Her waist wasn’t any thinner than when I last saw her; it only seemed smaller by comparison to her enhanced hips and thighs. They were incredible — no other single word can do them justice.
[Detailed description of hips and thighs from the front]

I see you’re very intrigued!” She giggled, pulling my attention back to her face; the same face I knew and loved, unchanged despite everything else. “But the front view is just the appetiser: this is the real surprise!” As she finished that sentence, she twirled on her heel to turn her back to me. I barely had time to gaze down before
*SMACK*

and my mind was conquered.

It was perfect. Perfectly round. Perfectly full. Perfectly pert. Whatever exactly had happened to Evelynn was unbelievable. Her wider hips were obviously to accommodate the magnificent ass they now had to support. It was as if her ass had been re-sculpted by a goddess of love to add as much sex appeal to her body as possible. Any bigger, or on a different person, it might have looked cartoonish and wrong; but on her, it was perfect. The after-effects of her smack were still rippling through it, but Evelynn had already started adding to it by swirling her hips back and forth. Her cheeks swayed with a perfect, jiggly weight.

It was impossible to look away from.

Impossible to think about looking away from.

Impossible to think... about anything else.

Somewhere else in my mind, I was aware that Evelynn had craned her torso and neck around enough to look at me. She laughed, and the sound echoed around my consciousness.
"Oh man! There's no way that's gonna get old! When my sister walked in on me this morning and started drooling over me it was just funny, but when it's you......"

"I wonder what exactly is going on in there?" I could hear her really start to think about the situation.

"Jacob, can you hear me?" Her voice was soft and comforting.
"Yessss", I heard myself saying, as if it came from somewhere else.
"Okay... um.... what... do you think?" She asked, not really knowing where she was going with this.
"Your ass..... amazing..... perfect....."
"Okay, wow that was direct..."If I could have looked at her face, I probably would have seen her blush. "Anything else?"
"No.... only asssss.... no other.... thoughts...."
"Oh, uhh..." She paused for a second. "Wait, then- Raise your arms above your head!" She ordered quickly.
The order became a thought, entering unbidden into my mind. My arms were pulled upright over my head; I barely even noticed, all I wanted to do was keep watching her perfect cheeks jiggle and sway.
"Woah... if that's real then...". She paused again, deep in thought.

After a few seconds, I heard her voice again.
"Yeah, I guess that'll do... Okay!" She sounded determined.
"After you exit this trance, until I tell you to stop, you'll match every movement of my lower body with your own. Your hips, waist and legs will move in-sync with mine. No matter what you want them to do."
She let the words hang in the air for a few moments. Since my entire consciousness was a bit preoccupied, I didn't take much notice as the order settled into my mind, becoming an immutable law. It was as if the door to my mind had been unlocked and left wide open, and her words had walked on in and made themselves at home. Given how this whole thing started, I would have found it ironic if I had been able to think about it.

I heard her speak again. "Right. Well, I guess I need a way to wake you up now. Not sure if just stopping and turning around will work let's do the classic. When I snap my fing-" She suddenly stopped. A smirk spread across her face.
"I've got a way better idea. When I smack my ass, you will awaken from this trance, and you will clearly remember everything that happened. The command I gave you will remain until I tell you to stop."

With that, she twirled again so she was facing towards me. Without her new asset to dominate my view, I could feel the fog in my mind clear slightly. I became aware enough to notice her right arm swing down and behind her body.

*SMACK*