Onahon à la Mode is the direct sequel of Kirakira Onahon.
In Kirakira Onahon, Cure Miracle was sent by Sei Yokubar to the Kirakira PreCure à la Mode's world.
She managed to transform four of them into onaholes: Cure Macaron and Cure Chocolat off-screen, then Cure Gelato in front of Cure Custard.
Kirakira Onahon concludes on Cure Custard's transformation and Cure Whip's arrival at the pâtisserie.

Onahon à la Mode resumes right there and shows the fate of the last two Pretty Cures: Cure Whip and Cure Parfait.

I'll be translating and uploading the last two (Happiness Onahon and Kirakira Onahon) afterwards, so that everyone can read and enjoy the "Onahon saga".

Enjoy this humble translation.