He's super adorable!
I'm glad that you adopted him; the fact that his previous owner would assert that a cat doesn't need to be fixed just because it's a male and can't itself
get pregnant indicates to me that it's a darn good thing she rehomed him. I'm really bothered by that sort of attitude, and thinking like this, to me, clearly demonstrates that you aren't responsible or mature enough to own a pet
(end mini-rant)! Yeah, I know, I'm preaching to the choir.
I'm sure Agnes will get used to the idea of sharing her house eventually. In the meantime, give her lots of love, and do make sure you take librarychick's advice and get the new kitten checked by your vet before you do any face to face introductions.
I've gotten a few pets from weirdos...
It's humorous because I can commiserate. Not that any of my current cats have come from shady, rough looking dudes in grocery store parking lots or anything, but one definitely ends up dealing with some weirdos while doing cat rescue, and I've definitely offered to rehome cats for a couple of the stranger ones in the hopes of preventing the grocery store parking lot, or some similar, scenario.