So what if Zoras wipe/clean their mate’s headfins and it’s like someone brushing the hair of their partner/s.o. Anyway, it’s very intimate and personal between them. One day, Link and Sidon are relaxing against each other–maybe Sidon’s resting his head on Link’s lap–and Link just starts idly running his fingers along Sidon’s tail. Sidon perks up and almost immediately just wags his fin out of sheer happiness.
Maybe it’s the equivalent of Zora kissing? >w>