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She took my fingers to her mouth
The kind of thing that makes you proud
That nothing else had ever
Worked out, worked out
Oumota Weekend Day 2: Tattoo
Basically, a soulmate tattoo au where the idea is that when you touch your soulmate for the first time, a pattern-like tattoo/mark starts slowly spreading on your skin and will only stop spreading after you touch your soulmate a second time.
Some people only have a small spot of a pattern while others are completely covered in it.
It took months of Kokichi hiding his soulmate pattern before it reached his jaw and Kaito found out.