Auntishly

Besides, my matronly character, years, &c. entitle me to treat you if not maternally, a little auntishly.

Source: wiktionary

“[…] I saw a girl buying chops in a butcher’s while I was waiting and I thought Eric ought to paint her. He’d go mad at sight of her. She had everything a painter wants.” […] “What do you mean by everything?” she auntishly asked, becoming aware of what Val had said about a girl buying chops. “Raw beauty,” he teased, “unadorned and to be adorned by the painter; myth-making face; body excavated from mythology too.[…]”

Source: wiktionary

Whatever Mother and Father, and Aunt Rosa Bona auntishly doting and chirruping under her platter of feathers, may believe, I have never really seen their faces.

Source: wiktionary

There were French and German horses among the entries and a great many foreign visitors – ‘quite a babel of tongues on the roof of the grandstand’ clucked The Times rather auntishly.

Source: wiktionary