Just my .02....
You know, it does take two. There was a "fully intact" male cat waiting for her. That's what irks me about people who have outside male cats. I suppose that since it's not their kitty coming home with kittens....
It was an accident, plain and simple. These things happen (cats can be sneaky!) and there usually isn't a problem finding homes for the cute little ones.
ETA: We were posting at the same time LOL! I'm glad that the babies already have homes

It's a plus that you'll be able to see them grow too!