I looked on WMM and found, to my surprise, that there is no file concerning an armpit fetish. There are files to implant fetishes for almost everything else, but no file mentions armpits (with the possible exception of Professor Pig's Pig Musk). I think this would be a great addition to the available files. Surely I'm not the only person on here who thinks a file to induce an armpit fetish would be a good idea.
I'm quoting from Vive's description of his Foot Fetish files (suitably modified), but the idea is the same:
Armpit Fetish Active:
Listen to this file if you want to worship your partner's armpits. This file gives you a deep craving for it. When you do it, you will enjoy his armpits even more deeply. Everything else will fade from your mind as you focus on the here and now. All that exists are your partner's armpits and your pleasure. And this will be extremely pleasurable. This file can be used together with Armpit Worship Passive for your partner.
Armpit Fetish Passive:
Listen to this file if your partner desires to worship your armpits. This file can help if you want to fulfil your partner's desire, but still have doubts about them worshipping your armpits. It will help you to enjoy this symbiotic experience with your partner as well as massively increasing the pleasure you feel from it. Even if you don’t have a problem with your partner worshipping your armpits, this file will increase the pleasure you derive from it. This file can be used together with Armpit Worship Active for your partner.