Thank you for the knowledge @chewbaka, I appreciate itWelcome to JAV VR. Considering your fetish, VR is probably the best way to experience it haha. I don't go for it myself, but hey...you do you.
You can actually search for that fetish on Afesta.
Here you go: https://www.afesta.tv/en/search/all?keyword=armpit&page=1&vr=1
There are compilations that are just armpits all the way. They're quite cheap and Afesta's stuff doesn't have DRM.
Here's a similar search on Fanza, I put in the VR and armpit keyword for you already.
年齢認証 - FANZA
From here on, it will be an adult site that handles adult products. Access by anyone under the age of 18 is strictly prohibited.video.dmm.co.jp
If you can find it on Afesta, get from there instead. Fanza stuff has DRM. The excellent KAVR-353 can only be bought on Fanza though. I'm not an armpit guy, but even I like that video cos Futaba Ema's breasts are just so perfect in it. If its a KMP video (VRKM, SAVR, KMVR) or SOD video (3DSVR), you should be able to find it on Afesta.
I will go check it out!