she cheated on me, so I slept with her brother

Aphmau and Aaron have been dating for a year now, Aph has been living with her brother, Ein, for three years, and against his wishes Aph throws a party and invites a bunch of people, including Aaron, during the party Aaron loses Aph, only to find her in her room sleeping with Garroth, filled with sadness Aaron runs into a random room while being drunk while sitting in the room Aaron see Ein come out of the bathroom with just a towel on, and Aaron being drunk gets up, walks over to Ein and starts to make-out with him, Ein not minding starts to kiss back and one thing lead another, Aaron was now on Ein's bed with Ein on top of him. want to find out what happens next? read to find out. (please don't hate the book or the ships)