Submissive on LetMeJizz
Plenty assume this means rough, but a lot of it runs soft, a willing partner kneeling, waiting, taking direction without a hand ever raised. The real marker is the power handed over rather than the force applied, and the strongest scenes sell that surrender as genuine instead of acted. Restraints, collars and commands show up often enough, though the heat lives in the obedience itself.
595 submissive 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.