We take Natasha, her perfect tight ass and put her into a very strict Hogtied. Her elbows are bound together and her hands are folded backwards up her back. This is the definition of helplessness. Her ankles are bound in a lotus tie, her hair is bound back pulling and stretching her neck back.
It is very interesting how different people react to hard bondage, and it's more interesting watching a girl cum when you can tell that even if she might not want to, she can't do anything to stop it.