There are three series, as well as two standalone novels in the Wolves of World and five series in the Mpreg World collection This is the official reading order for those two worlds. Any Kiki Burrelli series not listed here exists in its own universe.
Wolves of World
Wolves of Walker County, Wolves of Royal Paynes, Soul Warriors of Royal Paynes, Demon of Royal Paynes, Wolves of Resurrection Road
Lust (coming soon)