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one-finger caress
To touch or stroke gently or lovingly with one finger. A gentle or loving touch.
This tag was made mainly to refer a penis being caressed by a single finger, but made vague to also include other body parts.
The pixiv tag associated mainly with this is chinkari, which means scratching the penis with the finger(s) or fingernails. It is an abbreviation of "chinchin karikari."
Chinkari (penis scratch) often features a penis being scratched or caressed with one finger, however it's not strictly just one-finger, but it most often is.