Wow 2 days just isn't enough time. You have to do a gradual introductions with them. Keep them separate first and rub the kitty with a towel and give it to Hobo to smell and do the same to Hobo for Aslan to smell. Then after a few days, put Aslan on your arm and walk around the house with her and then let Hobo smell her rear as this is how they get to know each other. After a few more days, under supervision, let them meet each other. It is only normal that some hissing will go on. After a period of time, they will get use to each other.

Both your cats are adorable orangies.

Good luck.

OOPPSSSS sorry, I just saw your update of Hobo grooming Aslan. This means that Hobo has accepted Aslan into the home. But don't be too surprised if Aslan gets agitated by this, as widdle ones do not like to be held down when all they want to do is play.