create alias spanked -> slap_mark
spanked can all be aliased into slap_mark. To begin with the tag spanked is to simmilar to the tag spanking and can be confusing. If somebody wants it to be specific a simple search of "ass" and "slap_mark" would give a user all the results that could wish for.
EDIT: The tag alias spanked -> slap_mark (forum #147456) has been rejected by @Hillside_Moose.
Updated by DanbooruBot