They came from the same house and their parents grew up together before either of them were even born. Zeus was 2 weeks OOP when we got Ari, so they have actually always been in the same house aside from the last month and a half we had Aristotle here as a solo glider waiting for his friend to come home. Aristotle came with us every time we went to visit Zeus too before his homecoming... so the sounds and smells should actually be familiar. (As familiar as they can be, with the knowledge that after a few days apart it becomes pretty irrelevant because it was not a constant.)
I was not planning on getting either of them neutered actually. Mostly because I don't ever plan on introducing a girl to them. As far as Aris maturing, well he *is* actually starting to lose a bit of fur on his head... so I think he's well on his way. His smell hasn't gotten any stronger, and he doesn't mark me even when he can hear the baby. He's pretty good about that. (Hmm.. or I am just that used to his scent. LOL) No one coming into the home can smell glider though, so I am assuming the smell is not overbearing just yet.
My hope is that since they are so close in age, and the fact that we only plan on ever having the 2 of them, and no more (unless something tragic and unforeseen happened)... that they would both be fine intact. I've never been a fan of neutering animals because domesticating them is unnatural enough... neutering is just more unnatural than I could handle. I also maintain this stance with the full knowledge that *I* alone am responsible for anything that happens as a result of my decision to not neuter them. (For instance if I had a cat that remained intact and she had kittens... it would be *my* responsibility to care for the litter and/or ensure they went to wonderful forever homes as opposed to 'dumping off the kittens to anyone that would take them to get them out of the house.)
I've always been this way, so I don't imagine I will change my mind about that any time soon.
If my logic here does not hold up though, and I have missed something that is detrimental to the well-being of my boys - then I welcome advice there too.