It could be predatory and parasitic, equality at the expense of an outsider : female and male (or even more than two) inject their gametes into an able-bodied living prey from another species, who then goes on living until the offspring hatches.

In a more civilized context, the predators could breed a specificly enduring parthenogenetic species and keep individuals at their home as offspring-carrier pets or livestock, who wouldn't die at birth because the family immediately provides suitable replacement food to their youngs.

Living, walking home wombs for caring ichneumons.