The bulk update request #8653 has been approved by @Hillside_Moose.
create alias multiple_fellatio -> cooperative_fellatio
The term multiple_fellatio is confusing and not clear at face value. It more or less forces a person to go to the wiki to get the exact meaning. The term doesn't inherently mean "2+ characters fellating the same penis". Considering "fellatio" is just a fancy word for "blowjob" the term means, put simply, "multiple blowjobs". Well in an image with 1 character sucking 2 dicks there are multiple blowjobs. In an image where 2 characters are giving 2 separate blowjobs there are multiple blowjobs. Hell if you want to get REALLY crazy in an image where 2 characters are sucking their owns dicks there are multiple blowjobs. Realistically this tag could apply to ANY of those situations...only with the help of the wiki can one glean exactly which one it's supposed to be used on. The tag is frankly terrible.
I propose collaborative_fellatio because that term is so much clearer. To have a collaboration you need 2+ characters so it fits the current definition of multiple_fellatio perfectly...and it can't be reasonably confused with the other situations I already described above.
And btw I also think double_fellatio is pretty unclear as well, but I'm not so sure of a better tag to use for that one.