After the fight they came back to the underworld and the word of them winning the battle spread out through the world to each and every faction. Sparda threw the party in the underworld and everyone who belonged to the supernatural world were invited. They partied continuously for two days before Sparda was dragged back to his home by his future wives. The same case happened to all woke came to party.
They decided the rest of the games will be held in next month which everyone agreed. The loses were really minimum none of the major people died but whoever died they etched their name in pillars which were made on every factions headquarters who participated in the treaty. Kali and Kuroka proposed to Sparda to which he agreed. Soon he turned 20 years old and he decided to marry all of his fiancées.
All the factions were invited in the ceremony and Arato was crying the whole day seeing one of her son getting married. She was shouting the whole day how much proud she was for him. After the marriage was over Sparda received blessings from all the girl's parents. After the marriage Sparda went for honeymoon in his private beach which was gifted to him by Shiva. He had constant sex for 3 days they only stopped for food.
After that all of them moved to the underworld and Vali challenged Sirzechs for the Lucifer title and won. He became the new Devil King Lucifer which made both Sparda and Arato proud along with Rias. Next year Vali got married with Rias and Valarie. It was also a grand marriage. The same arrangements were made like in Sparda's. Arato did the same what she did in the marriage of Sparda. Sparda gifted Vali an island near Hawaii where he spent his honeymoon.
Then Sparda thought of where Issei was until now he didn't even remember him and like he thought he was lost in the background. He never gained the power he should have achieved by bullshittery. Sparda and Vali both were disappointed but what could have they done.
Both the bothers lived with their wives and mother in the underworld in the newly made Lucifer Mansion. Was the world free of troubles now?? No. But the Lucifer brothers lived happily ever after till eternity with their family.
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Like all things this must also come to an end. I don't know if I was able to make you enjoy or not but I definitely enjoyed this ride. For all my fans thanks for supporting me through thick and thin and I would always keep writing stories like this. I am writing another fanfic on anime & comics. Please vote till tomorrow.