I fell in love with my sister's boyfriend

Since Ethan and Damian saw each other for the first time, they couldn't deny these weird tingles and attraction they have for each other. Damain wants Ethan to be his, but what happens when Ethan is his girlfriend's younger brother? Read to find out ;) [Warning: some chapters have mature content] Note: The cover doesn't belong to me and can be taken down if asked.