Oyakodon: Oppai Tokumori Bonyuu Tsuyudaku de

A mother moves in with her daughter after her husband's death, where she also meets her husband's nephew. Slowly, she develops a sexual relationship with her nephew and an incestuous relationship with her daughter. This story heavily features lactation and is narrated by the mother, but is seen from the POV of the nephew.

Recommended anime

Aniyome wa Ijippari

Tsunpri

Victorian Maid Maria no Houshi

Betsu ni Anta no Tame ni Ookiku Natta n ja Nai n Dakara ne!!

Okusama wa Moto Yariman

Kagaku na Yatsura

Fushigi no Kuni no Succubus