Forbidden Love: When a demon falls in love with an angel

A demon, a strong, kind, nice and caring demon fall in love with a beautiful, kind, caring and nice angel. They say a love between a demon and an angel is forbidden but what if they only way for one of them to survive is to be with each other forever. He found out that the angel has 6 brothers, 3 real brothers, 2 step brothers and one half brother and all of them are an angel too. But also he will meet with his long lost step brother who is not a demon or an angel and the worst part is he is also in love with the same person. Will he fight to be with her or would he rather let her go? No one’s know about the existence of angels and demons but what it someone find out and spread to the world will they be treated like normal or will they be pushed aside?