Sakamaki & Mukami Brothers X Seme M... - Hamiltonoutpeace

Yui has been gone for exactly 2 months and no one has gotten word from her the whole time. One day she texts her aunt asking to leave and come back home. She sounded frantic so (y/n)s mom begs him to go and check on her. After much begging he goes to check on his younger cousin.
(Ok so this is gonna kinda be an omega verse thing, I'm sorry if you don't like that) P.S. If it's not already obvious I've never done one of these.