The Pixiv tag “R-18” means different things to different artists. For some, it’s equivalent to “NSFW”, but for many, it’s closer to “includes censored penetration”, and quite often “my mother would kick me out of the basement if she knew I fantasized about this”, with anything not quite as raw left open for all to see.
Gratuitous Mahoro to make it clear that this set has work-safety issues:
[amusing note: Google image search thinks this Mahoro image is related to the Mongolian Society of Interventional Radiology]
Aoi Futaba and her painted-on hot pants warn you that there’s naughtiness ahead.
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Sometimes you have to double-click to enter text in the form (interaction between Isso and Bootstrap?). Tab is more reliable.