Smothered in Tentacles: A Degenerated Married Woman Crawls With Carnal Desires Mako Oda(2014)

After his wife passed away, Mayumi married Shingo, who lives with his son, Kazuya, who he has forgotten. She had a fresh start, and she was her family who started living in a new land, but Mayumi was unable to get used to the new land. Kazuya gives her Mayumi a surprise gift.