An angels and a Demons heart

Meliodas is the next heir to the mafia the Gekido ( google translation 'loose temper)has two bestfriends one Ban who is part of the sins that works driectly under the mafia. His other best friend is Elizabeth. He claimed her as a 'personal servant' at the age of 4 in order to save her. Has over time fell inlove with her but never told her.
Elizabeth a 'personal servant' to him and his best friend. She is always by his side whenever he is not in any fighting nore any immeadit danger. She too begun to fall inlove with him but never told him because of his arrange marraige with Melody.
But after an attack happens. It has been 10 years since they both escaped. There feelings only grew stronger for each other. They run a bar in a town called 'britannia' a small town next to the ocean. But when one night he finally confesses his love for her...
What happens when the sins&Gekido finds out? What will happen if her secret that only he knows comes out? Will there be a fight? Will Meliodas takes over the Mafia? Or become the captian of the Sins again? Will he continue to run the bar when all of this is over with Elizabeth....

she was only 6 when the attack happened. meliodas is 30000 years and Elizabeth's curse is broken just does not rembers yet..