Write the first chapter for a wholesome novel starring two teenage girls in a close platonic relationship who bond over their mutual love of wearing huge diapers and acting infantile. The two girls’ names are Pianitchi and Melodytchi. Pianitchi is a sweet, music-loving girl who loves wearing diapers just as much as she loves playing the piano, though she’s reluctant and bashful others will discover her infatuation for the crinkly undergarment, and thus only wears them whenever she’s alone or with close friends who also wear diapers regularly. Melodytchi is the complete opposite, being immensely friendly and outgoing, especially regarding wearing diapers, to the point she’ll gladly choose to wear one whenever she goes outside, and is not the slightest bit shy in openly and regularly prodding and patting her diaper in public, sometimes proudly flaunting her padded bottom with all the exuberance of an actual baby. The novel takes place inside Melodytchi’s bedroom during a casual weekend sleepover between the two girls with Melodytchi having prettied up her room in advance for the sleepover; both are bundled up with various baby apparel, including snug button-up onesies, oversized pacifiers and baby bottles full of warm milk, and more than enough packs of enormous diapers to last them the night! Include an exchange where the two have a friendly competition on who can drink the most milk before they can’t drink anymore, with their tummies ballooning in size and their onesie buttons popping off as both girls rapidly empty multiple bottles.