wait is this step father and son relationship ?

no, the grey/blondie haired dude only calls the dark haired dude 'dad'

kinda. the blondie was the children of the tattooed lover. he took care of them for some year's and wanted to be a family but they do not have blood nor legal connection. it's more of a creation and consideration thing with HEAVY dad kink. i say it's a "pseudo incest" vibes.