I’ve experienced this myself recently. There was a time when I couldn’t conceive being that vulnerable or dependent. It takes time to let those well fortified protective walls of manhood down. I literally didn’t know how.
One of the first nights I was with my guy he enveloped me this way and I melted into him. It feels like heaven. Later I realized that he needs it too, so I occasionally envelope him back. Being held that way is not a gender specific behavior. It’s a stereotype that serves neither gender. Each of us is both strong at times and weak and both are human and acceptable and healthy. Don’t wait until you transition to ask for a hug like that!