Oba Netori ~Otto no Shiranai Midara na Kankei~

Rieko Momose the protagonist's aunt. Tender and matronly, like a true mother always doting on him. She's fond of him but never thought of him "that way". Her relationship with her husband is healthy. They have a daughter. She's also incredibly sensual, giving off vibes that attract other men... ... while her husband seems blissfully ignorant of her needs.