I think this was suggested before but I cannot seem to find the correct thread so will post it again. :)

I just used all my side accounts stud slots for the week in a single day trying to mass breed for snowflake chance. All of them, gone, in like an hour so that I could breed lionesses on my main account to my side king.

I've spent thousands of SB on nesting material, food and toy bundles so that I could reverse breed the lionesses on my main account to my side king, again for mass breeding purposes. Which sucks, because not only have I wasted so much SB on reverse breedings but I've also used all of his stud slots without being able to make anymore SB from those slots.

This is annoying.

So I am suggesting an alternative;

Linked accounts can breed between them.
Only between linked accounts, and only if that account has rolled for the day (to prevent any frozen side kings from still producing cubs without aging). I could switch to my side account, go to a lioness on my main and if she is in heat just breed her normally, as if she was in the pride on my side account.

If that kind of option is not possible within the coding, perhaps something similar to the studding page, but instead of a limited number of stud slots there is no limit, and it is only able to be seen from your linked account. Other users won't be able to see it, and you could send requests to your side king from the lionesses on your main account and not have it take any stud slots, or have to transfer currency between accounts.