I've lurked for many years before making an account on this site and I gotta say, this might be my favorite picture ever. It's not the greatest art I've seen, but he's able to capture what makes Casual Nudity good perfectly. It's not so acceptable that they have absolutely no shame, but also not too shameful that they're comfortable hanging out outside like this. The playful, casual tit-grab only adds to this. Godly thighs too. And the artist even implied on Twitter that this is "a regular sight in Gensokyo during the summer". Everything about this is perfect.
Reminds me of a video--that I think has been taken off of youtube for copyright--where Marisa, Reimu, and Patchouli (I think) have a tea party with a gorilla dressed as Alice