The hero Quinn has slain the demon king and brought peace to the world with the help of Celeste, the great fairy of the forest. Now Quinn must repay Celeste for her aid with the promised cost: her firstborn child.

However, Quinn boasts that no man is worthy of being her husband, so she'll never have a firstborn child that Celeste can claim. Using this loophole, she plans to get out of ever paying what she owes.

Angered by Quinn's ungrateful arrogance, Celeste begins plotting her revenge. She'll make sure Quinn has a baby, but not with a normal husband... No, she'll create a monstrous, evil creature to sire the child. A slimy, tentacled beast made of mind-melting love potion will make the so-called "hero" and all of her companions regret leaving a debt unpaid.

Slimy Sextet is a visual novel where you play as Celeste's slime minion, helping her carry out revenge via tentacle sex! Do your job well by fucking all the girls silly, and who knows... maybe you can even turn the tables on the great fairy herself?

[From Steam]