She's found a mysterious chemical online

The relationship continued as for a while, you hung out, fucked, met with each other's friends, fucked, went on a couple of proper dates, fucked. Carrie was insatiable on the sexual end, if it looked like time together may end without her riding you at least once, she would have none of it, all but demanding a quickie. It did put in perspective just how eager she was to get things going in a kinkier direction. But as time passed, you started to think that maybe she had simply forgotten her promise. It made sense, it's not as if you had thought anything would come of it, you always knew it was physically impossible

But then, about two months after she had made her promise, a box had been delivered to your door, only information on it was from the post office, didn't even have a return address. You wee almost scared to open it before you saw Carrie's car pulling in to your apartment's parking lot mere minutes after the box had been delivered.

The apartment building had an external staircase, so you watched as she bounded up the stairs towards you as fast as she could go. She almost collapsed upon reaching you on the 4th floor from the sheer exhaustion of it

"Is that... it?" She gasped, trying to regain her breath.

You looked down at the package, it was still sealed, and still had no identifiable details. "Uhh... did you order something for me?" You ask slowly.

Carrie leaned against the outside wall until her breath returned to her, it didn't take long. "I ordered something for both of us" She said, trying to look seductive, a look that was somewhat diminished by the **** rush that had come so shortly beforehand, it was at this point that you noticed that she was wearing a loose-fitting belly shirt and sweatpants, not really her usual style at all. "Open it, see what it is, just be very careful with it. It's uhh... possibly illegal?"

Now very unsure, you beckon for her to follow you into your apartment before you start opening the package. Carrie was practically jumping up and down with excitement as you did so, only to reveal what looked like an canister of spray-on mosquito repellent.

You hold the canister up, peering at it, it didn't have any labels or even instructions on it, instead it seemed mostly covered in an alarming collection of warnings; "do not take orally", "keep away from children", "Use at own risk", "Eat well before and after use", and, most alarmingly of all "All effects permanent"

Carrie squealed with delight, clapping her hands together. "It's here! You know I wasn't entirely sure it was real, had to go deep diving on the web to find it, but it's here and soon" She winked at you "Soon your girlfriend's big fat belly will be a reality."

Now you were more confused than ever, you gingerly placed the canister back on the box, now quite afraid of what it might do. Carrie rummaged around inside the protective packaging in the box and pulled out a sheet of paper. "Here it is" she said cheerfully. "Instructions on the adiposity applicant"

She cleared her throat, then began to read. "The adiposity applicant is a fast-acting, short-lifespan chemical. When applied to the skin, it will be absorbed into the adipose cells in the area applied, forcing them to multiply rapidly and making them absorb nutrients to fill with fat. The chemical is quickly broken down into nutrients for these multiplying fat cells, so it does not spread via bloodstream. Effect is increased with dosage." She read aloud, looking up at you occasionally.

Your eyes were wide, this was it, this could do what you had thought impossible. You could give Carrie a massively fat belly, without her getting fat anywhere else on her body. This... shouldn't be possible, but Carrie was looking at you with those adorable eyes she could use to make you do whatever she wanted, as she picked up the canister again and pushed it into your hands, before lifting her shirt to reveal her waiting abdomen.

"Well hot stuff?" She said with a sly look. "Go nuts"