Stop Adding To My Harem!!!

When Issei got betrayed by the people he trusted the most. He went to the Vali team for help. There is where he met Vali's hidden girlfriend. Vali took him in and Issei found out that Vali was one of her mates. Serenity on the other hand seemed quite content with her mates and didn't want any more. Much to Serenity's dismay, it seems the world wants to throw as many mates at her as it can. All Serenity wants is to live peacefully with her current mates. Why must she have more!?