What's the Japanese-language term for an "old maid" (age 25-40) fetish?

I remember seeing "oyaji gal" in 'Even a Monkey Can Draw Manga,' but that's not what I mean. It's not mothercon I'm thinking of, either.

Yukari from Azumanga Daioh might be a good example. "Female teacher" fetish? Like, the typical sensei-and-student storyline but with genders reversed, would be an example, but more specific than I'd like. Or, Misato, from Evangelion, even (but her character design's more youthful than I mean).

I'm looking for the correct terms I should be searching with to find titles to use on Share. Anything's help, though! Thanks!