You enter the unisex changing room, you are alone. You set the box down on a bench, and look through it. A green bikini with black piping, triangle style with tie sides on the bottom, and the back and neck of the top. I had a brazilian bottom, and the top was kind of small. I liked it for some reason declaring "this is the one for me", so I took off my t-shirt and put the bikini top on... I tied it behind my back and neck, which seemed almost second nature as I did it. Momentarily I thought about what was going on, then out of the corner of my eye I saw some areola poking out, and tried to adjust the tiny top to cover it. As I did I noticed that my areolas and nipples were expanding. I stared in amazement as the breast tissue under them started to rapidly expand. My boobs swelled up and out, tugging at my chest under the skin all the while. They stopped abruptly, and with a bounce, when I reached a 48 FF cup. The bikini top needed adjustment so I fixed it, but as I brushed the fabric covering one of my nipples, I shuddered, and felt horny. Again I questioned things, but I continued with my nipples for several minutes until a lock of brown hair fell into my view, followed by two more. I brushed them back, and got up to see into the mirror...
I am, from the chest up a sexy brunette. My arms were a third the size they were minutes ago. Nail polish Light pink, makeup ie masscara, light eye liner(black), and bright pink lipstick appear on my face, as if it had always been there. I smiled to myself, grabbing the bottoms, after swiftly removing my pants and boxers. I would have put the bottom on, but two guys entered the changing room, and I quickly slid into a stall. I could here them joking and changing. After a few minutes one of them noticed the box... "Hey Tyler look at this, its a box of girls swimsuits." said Jack. I quickly slid the bottoms on, watching my penis shrink down to a clit, and retract into my groin, my scrotum repositioned itself as my new lips and labia, while my testicals shot up inside and repurposed into ovaries. I looked quickly at my legs, saw smooth feminine skin, and walked out of the stall. Tyler and Jack looked up I burst out, and promptly doubled over. My insides shifted as my waist contracted. My hips flared out as my ass trippled in size, my vagina expanded to 10" deep, all of this was very painful. I cried out as I tried to move, slumping back to the ground. The two boys tried to comfort me after seeing all that. I felt my ass grow a little more, and the pain disapated. I slowly got up, eyes closed at first. I opened them and saw myself in the mirror. I was startled to see myself a light brown cocoa colored woman, who stood 5' 5" tall, 140 lbs, 24 years old, 48 FF x 24" x 52" with medium brown hair which fell down to my ass, hazel eyes, and sluty disposition. My dark brown areolas poking out each side of my bikini top, my giant ass cheeks out each side of the bottom, and my labia clearly defined in the front. I now look like a young hottie, although kinda slutty mostly due to the thong seeming bikini and my giant boobs and ass. I giggle at the two boys with full hard ons, and open mouths. "That box is from the bar, I got this sexy green bikini out of it. I was a guy who wanted a drink an hour ago, now i'm a hot ebony slut." I said. Jack asked if I liked being a girl now, and I told him I loved it. Then he asked if you were really a slut...