The Married Selena and the Dungeon of the Magic Stone

Randy exterminates monsters in the surrounding areas and is respected as a hero.
His wife and party member, Selena, both retire from adventuring after defeating the demon king.
After giving birth to a daughter, they live peaceful lives as villages.
As time passed and their daughter grew…
After mingling with the villagers in her husband’s place,
an unfortunate circumstance causes a treasure to crack.
A powerful monster is sealed in the treasure,
and in order to fix the seal, she needs to gather materials from a dungeon.
A kind married woman becomes a sex slave of a lecherous dark guild.
What fate awaits the wife of the hero…?