I just answered TheGreenHero's PM on that, here's what I said...
meerkatgirl wrote:Actually, both people buy a breeding potion, since there will be about twice as many babies as a normal breeding with one owner. I hadn't thought of it, but I guess you could share the cost and the amount of babies would be the same as a normal litter. So, instead of 4-8 babies, there would be 2-4.
You can choose - both pay and have about twice as many, or split the cost and have the same as a normal litter. It's up to you ^^