Betrayed by the Hero, I Formed a MILF Party with His Mom! (Manga) Vol. 6

ANOTHER MOTHER DESIRES CERES'S HAND IN MARRIAGE, BUT FIRST, THE FIELD OF BATTLE AWAITS! After marrying all four of the heroes' mothers, Ceres couldn't possibly have room for another woman in his life, right? Wrong! His next wife might be none other than the widowed princess of all the realm, Marianne. But before they can discuss the terms of an engagement, Ceres must do battle with Mammon, the strongest warrior in the demon king's army. Mammon is holding the four heroes hostage, and Ceres is determined to save them. After all, he's technically their stepfather now! Pushed into the fight of his life, Ceres must fulfill the promise he made with Marianne: To come back alive, no matter what. In the heat of battle, his new draconic power shows its worth!