You have decided upon a bottle of shampoo going by the name of "Crimson Feathers". The bottle, in the shape of a phial with its cork, depicts a bird with bright red and orange feathers, its plumage becoming breasts and the face of an extremely attractive woman. It clearly shows the boobs of a woman, even if it is only a picture. It's probably a European brand. The shampoo is brightly colored with a red liquid with orange and yellow shimmers aded to it. It looks like the bottle to be found in a wizard's lair. The store certainly caters to people that love all these nerdy and geeky fantasy things. It’s not really your cup of tea and you decide to try out the shampoo. If it's just like other brands to be found at other normal stores, you won't come back to the fantasy one. You cynically think that more than probably, all the budget went into the marketing and not into the product itself. But ah, you'll see. Your parents and brother are gone and will not be back for a few hours so you decide to treat yourself to a nice long shower. You'll check how the shampoo with the naked bird-woman is. You don't know it's a harpy but you will soon...
You turn on the shower to a very hot temperature and let yourself be engulfed by the warm water and rising steam. Oh, it's heaven!... So relaxing and delightful!... You pour the shampoo upon your head. It smells good, at least. Very good, even. Its scent is that of fresh mint, peppermint, poppies and even spicy. Just for that, that bottle was a bargain. You lather your scalp and even scrub the shampoo upon your body so that the wonderful smell will rub into your skin, alongside your locks. Your hair is light brown and reaches halfway down your back. You rinse everything off but before you can step outside and dry yourself, you feel a tingle. It starts with your head but then spreads fast to the entirety of your body. You start to panic. Oh, no. No, no, no. That product must have contained toxic elements. Will you go bald or suffer severe burns? You notice that your hair has turned bright orange with red and yellow locks. But the prickling of your legs and arms increase and your attention turns to that. Your feet and calves start to harden their epidermis and your toes become crooked, the nails becoming talons. Your arms elongate, your hair follicles become feathers and you become endowed with wings, your body covering itself in feathers and your legs being scaly and that of a bird of prey. The bathroom mirror tells you that your eyes now look like an eagle's and you have kept your face and breasts, the former being now completely blemish-free and the latter firm yet small. Mere bumps. You are like the monster on the bottle of shampoo. A harpy. You know that instinctively. Your instincts also push new urges upon you.