Fellow appreciators of armpits, here's something you should consider checking out if you haven't done so already. A cute little manga that's at the same time also a goldmine of gratuitous armpit shots.
https://mangadex.org/title/077de7b6-ea9d-4e41-a4be-6b9eb73e308e
I'd point out that PatchUsagi's already been documented in the collection, but you've once again brought a great batch of haul that I can't even be mad :p. Thanks for both the links and the correction regarding YajyuImouto.
I'm far from proficient in Japanese, but I'm capable to read Katakana / Hiragana to some degree.
Though to answer your question on whether or not I'm bilingual, I guess I could be considered as one, seeing as English isn't my mother tongue, lol.