relax into something
1. to sit or lie down in something, relaxing. I want to go home and relax into my easy chair. I relaxed into the reclining chair and was asleep in a few moments.
2. [for something that is tense] to assume a more relaxed shape or condition. His cramped muscle finally relaxed into a soft mass of tissue. As her tight neck relaxed into softness, her face brightened.
relax one's hold on someone or something
to lessen one's grasp on someone or something. When she relaxed her hold on me, I got away. Never relax your hold on an alligator.