Daddy on LetMeJizz
The word works as an honorific in this corner, a submissive moaning it at whoever is running the encounter, with no family angle behind it at all. That is the line that keeps it separate from step and taboo content, where the kink hangs on a pretend relation. Here the focus is power, usually an older dominant man dealing out praise, instruction and a firm hand while the younger partner leans into being guided. The heat comes from the dynamic and the tone of voice more than from any roleplayed backstory.
257 daddy videos here, all HD and all free. New ones go up daily, so check back if you don't find your scene first time around.