This is Minamori Shizue from Shukubo no Uzuki ~Hitozuma, Miboujin no Ureta Karada to Amai Toiki~. She is the colleague of the protagonist.

Her prompts:

shuzmish, mature female, black hair, single hair bun, blue eyes, glasses, lipstick, earring,

You can add wedding ring, but it seems to cause problems with certain poses.

Her usual outfit:

formal, suit, skirt