Derpy might often be preoccupied with her growing breasts, but her first priority is always going to be the proper raising of her daughters. Her partner, Berry Punch, fully agrees.

Still, most of Ponyville has either gotten used to or resigned themselves to Derpy's eccentricities. Also, raising children is stressful even when everything goes well. Therefore Berry arranges a trip to Canterlot, just for the two of them, knowing full well that Derpy will find it hard to resist an audience which has never before been exposed to the spectacle of her great size and shocking lactation.

Why, Berry has even gotten them into one of the palace tours for tourists, assuming that Derpy would particularly enjoy making a splash at so elevated a venue. And who knows, maybe she'll even find some ponies willing to sample her milk to make her grow some more.

You know the drill by now: Lactation, breast expansion, masturbation, very public lewd behavior, and, new to this story, a large mare with a large penis in the last chapter. Some minor stomach-bulging mentioned briefly. These kinks are probably going to be contained to this story for the time being and not show up in others.

cover art by Ponyrail, even SFW this time.