Bombay kittens & cats in State College, Pennsylvania

I adopted Ash in late June of this year. He is estimated to be about one year old. He is very cute, silly, and playful, and is very good around people, including strangers. I am really sad to send him away, but I am certain that whoever adopts him will love him. Unfortunately, soon after I adopted Ash, I inherited a family member's cat. Over the last 3 months I've been trying to acclimate the cats together. During the separation phase, Ash displayed aggression when he heard/saw the new cat, but he calmed down and they seemed to be ready to meet. However, when they were finally in the same room, Ash attacked her. She is a dainty, docile cat, and she was shaken by this incident for weeks, being unable to hear Ash's meows without running and hiding. I strongly recommend not pairing Ash with another cat, as Ash and I were happy when it was just the two of us. I can't rehome the other cat as she has been in my family her whole life, and hates change, so unfortunately I must rehome Ash.