Mary helped her cousin carry her luggage to the guest room, which would be for her during her stay there. When she picked up the bag she pulled it close to her body, but because she wasn't used to it, the edge of the bag hit her in the balls, causing her to let go and double over as she experienced testicular pain.
"Any problem Mary?" Pearl asked
"It's just the suitcase that is heavier than I expected and I ended up putting it on my toe." Mary said, believing it was too early to let others know about her dick.
"Sorry, I should have warned you about the weight of the bags. If you need it, I can help you carry it to my room." Pearl said
"No need, I just got a little careless." Mary said and lifted the suitcase, starting to walk now carefully so not to hit her still slightly sore balls again. Then she helped her cousin organize things and they took the opportunity to catch up.
After a while they decided to take a break, going downstairs and discussing what they would have for dinner. When they arrived in the living room Mary saw that the strange box, which she had forgotten where she left it, was there open just as she had left it before.
"What is this box? Is it a hobby of yours Mary?" Pearl asked when she saw the box.
"It's not my hobby, it's just something they left on my doorstep earlier." Mary said
"It says here that there are potions here that can turn whoever drinks them into whatever they want, this is certainly a joke. This open compartment has vials with dick designs, whoever created this is sure to be some pervert. They are sorely mistaken if they think you are such a fool as to take whatever is in these vials." Pearl said
"I actually drank from it already." Mary said
"Have you ever taken from them? Considering the open part, I think I even know which one it was. Whoever sent this must be laughing to know that you believed this would actually work. Did you really think you'd get a dick for drinking this?" Pearl said thinking it was funny
"You might think it's bullshit, but the potion worked. Look at this here." Mary said and lifted her skirt, showing her cock to her cousin.
"No way. Is this really true? It doesn't have any marks which makes it look like it's always been there and... wow, has it pulsed now?" Pearl said
"It's your fault. You looking at me like that is making me horny. If you keep this up I'll get hard real quick." Mary said
"You mean it's fully functional?" Pearl asked
"Of course it's functional. Why would I want to have a dick that doesn't work?" Mary said, her dick rising and getting rock hard. She started stroking it slowly.
"Tell me Mary, how does it feel to have a dick? Is it really good?" Pearl asked
"I feel great, but at the same time I can't describe it in words. You will understand much better if you try it yourself." Mary said showing the vial that made the dick grow and the size ones.
"I do not know. I'm really curious, but what if it's irreversible? I don't want to have a dick forever." Pearl said
"Don't worry, I'm sure there must be some to get back to normal later. Anyway, just say what you want later, it's too soon now." Mary said
Pearl then chose the activator and the size one and drank it, being convinced by her cousin to take off her clothes before they took effect and so she could better see the changes in her. Soon she felt something turning in her womb, then saw her vagina seal completely and loosen in her sack, her clit grew on her new cock, a little bigger than Mary's with her 8 inches long, while the new pair of her testicles fell in her ballsack.
"This is amazing, I can't believe I actually have a dick now and...uhmm...it's sensitive, especially on the tip." Pearl said, moaning a little as she touched her new cock
"You'll like it even more when you come. Come on, do like me." Mary said and started jacking off. Pearl copied her movements and they continued until they both came. The two of them soiled the coffee table with their cum as they ejaculated, but no one cared as they judged their orgasms good enough to have been worth it.
After their orgasms they dressed appropriately before ordering dinner at a restaurant, and cleared the coffee table in the living room while they waited. Afterwards they only talked a little longer before deciding to retire and go to sleep.