Harry is a real cutie!!

I agree, getting a male companion for your female is a good idea. Ive noticed that unless they are raised from kittenhood together, females do not get along well the majority of the time unless there are more cats than just the two. When I was younger, we had a pair of female littermates and even though they grew up together they hissed and spat at each other from time to time. My Remus hates male cats *all except for my MILs cat Draco* Spook (a female) and him get along wonderfully however *Spook actually hissed at him first during the introduction lol*

Good luck in finding a friend for your kitty