Years passed and Voldemort and Corvus kept their promise to never be separated again. Yes they had arguments as any couple would but it did not take long for them to make up. Voldemort and Corvus would never die, Corvus's status as an incubus kept him and his mate (who once again had all his soul pieces) alive. And with the blood mixing ceremony that Corvus and his siblings went through Corvus forever had his family. Fred and George continued their joke shop while helping their Dominus and his mate (the minister) with weapons and other helpful things. Fred and George were happy with each other, finally no longer having to hide their relationship and got married within a year of the end of the war.
Neville and Luna also got married and became the heads of the auror department as well as magical beast researchers and advocates. They had three children who also gained the immortality of the parents and uncles. Seamus became Harry's personal body guard, never settling down but becoming a true bachelor.
And they were a family, as crazy and impossible as possible, they were a family as they were always meant to be.