This prompt us open unless otherwise stated.

Summary: The basic idea is that a plain girl with a petite, boyish body undergoes a slow transformation until she has full curves and a sex drive to match. I'd like to play out this process. The target of her desires is her long-time friend and roommate. Below is an idea of what it could look like, but the details are negotiable. I could also see this including something more fantastic, like a Catgirl transformation, if you like.

As your roommate and close friend I probably noticed something was going on pretty early, but I didn't exactly say anything. This isn't the sort of thing a guy brings up to his friend, especially when that guy has a girlfriend.

Looking back, I guess the first clue might have been the time we were playing video games together. You kept squirming and adjusting your bra. I think it would have been fair to say you were a small-breasted girl. I asked if everything was okay.

"I think my clothes shrunk in the wash or something, are any of your clothes fitting weirdly?" you asked.

"I don't think so…"

"Do you mind asking the super to look into it… please." You're a shy person, and reserved, so I normally did the talking for the two of us.

"No problem, I'll do it tomorrow. Why don't you put on something more comfortable for now?" You smiled and nodded after a word of thanks and we got back to our game after you changed.

The next thing was I remember going for a shower and a bunch of bras were drying in the bathroom. I didn't mind at all. I knew that was just part of living with a woman. I gathered them up. They seemed awfully big for you though. 30C? That didn't seem right at all. I asked my girlfriend Zoe if she had left any bras behind and she said no.

Then how you dressed changed. You were a short, petite woman. Most people would call you cute, for sure. I thought you were always prettier than you gave yourself credit for. However, a lot more often you were wearing hoodies and big sweaters. "Aren't you warm?" I asked.

"I'm fine, really," you answered quickly, blushing.

I wasn't convinced, something seemed… off. "You know you can always talk to me, right?"

Your big eyes went shiny and you rushed to me for a hug. Your sweater moved oddly and as your squeezed your arms around me I thought I felt something… soft squish against me.

The next thing was really hard to ignore. It was the middle of the night and something woke me up. I checked the time and rolled over to fall asleep.

Our bedrooms share a wall. It means sometimes privacy is hard. As I closed my eyes I heard a moan very clearly. My eyes popped open. I was very awake and the sounds didn't abate. Through the drywall the sounds of your pleasure drifted into my room. After a while they culminated in a squeak of an orgasm.

It was totally reasonable. It's not like I hadn't jerked off in my room or had sex with Zoe. Given the time you had to assume I was asleep. I wouldn't mention it and it would be fine.

However, I woke up a few nights later to the same thing. And again a few nights after that. Then you started to do it when we went to bed, and you were getting louder. About a week later I heard the buzz of a vibrator… and you talking. "Oh yes… oh fuck…" you moaned. I tried to block it out for the most part. Sometimes I put in headphones… and sometimes I listened. "Fuck me! Fuck my tight, little pussy!" I blushed, it seemed crazy for you to talk like that.

It became part of the routine and I would get hard listening. I couldn't always resist and I would jerk off and pretend you weren't the cause. I tried to shield Zoe from it in case she got jealous.

You looked… different in ways it was hard to be sure about. You seemed so bright and energetic. Your smile was electric. Your sweaters seemed to be covering something up… I noticed that your shorts seemed tighter too.

I finally got to see what was happening to you, but in a way I never would have expected.

I woke up and my heart was racing, like I had a nightmare. Then I felt a warm, wet mouth go around my hard cock. I groaned as I processed the pleasure that was racing through me. My brain jumped to Zoe, but she hadn't spent the night.

I propped myself up and you looked up at me, your small hands wrapped around my thick shaft, your big eyes staring up at me with my dick in your mouth. "What are you doing!?" I said, panicked.

"I need it…" you said, as though that explained everything. I moaned, I couldn't help it. "You're so fucking big…" I looked enormous compared to your face and hands.

You played with my cock, pushing me closer to stunned orgasm. "I want your cum inside me… I want it all." I was breathing hard and looking down, not believing what was happening.

"You can't…" I protested, "Zoe…"

"Shhhh, it's okay. I need this. I need you so badly, please. I couldn't resist any longer…" You stopped your oral performance to pull off your top. The dim light of the room caught something I couldn't believe. Two big breasts popped out of your top. I ogled you and you purred at my attention. "Do you like them? I didn't at first… but they feel so good." You lowered yourself back to my dick and I felt soft titflesh brush against my skin.

You sucked my dick and I writhed in my bed. You took a moment to add, "E-cups. That's how big I am… but they're getting a little tight." You giggled and took my throbbing cock into your mouth until I shot my seed into your throat. So much flooded your hungry mouth. You moaned like you were cumming.

You licked me clean, thanked me, and went back to your bed. I lay in bed utterly flabbergasted.

Things changed quite a bit after that. You stopped wearing the sweaters around the apartment. My cute, skinny friend and roommate was growing into a curvy fertility goddess. It was amazing… and you knew I liked it.

Causes: We do not need to establish a cause. If you want it’s some strange hormonal condition spiraling out of control, it could be a biological second puberty, a reaction to some medicine or chemical, or magic.

Writing Style: First or third person is acceptable. Please write properly, and generally I like to see a couple paragraphs at a time, but it doesn’t need to be a novella.

If Interested: Share with me your thoughts about your character, give me a sense of who you/she might be and any kinks you’d like to emphasize/include. If you have any thoughts to the cause feel free to share. I like to write long-term, narratively driven RPs with characters we care about that allow both of us to explore our kinks.

You can find my DPP Profile here which has more information about my kinks and preferences.