In case anyone hasn't found this care information on house snakes yet:
http://www.kingsnake.com/housesnake/index.html

Quoted directly from the breeding section:
I remember the first time I was looking into getting a pair of House Snakes. I called one of the major importers (captive-born babies were very rare back then).
"Have any African House Snakes?" I asked, hopefully.
"Yep, we just got a batch in from Tanzania a few days ago," replied the importer.
"I'm thinking of getting a pair. Do you think I'll be able to breed them this year?" I knew that wild caught snakes often take a period of acclimation before they will breed in captivity.
The voice on the other end of the line seemed amused. "Yeah, that's a real possibility, since they were breeding in the bags all the way over here from Africa!"

Such was my introduction to the prolific African House Snake!