ensconce (oneself) in (something)
To plant or place oneself in a particular thing, setting, or situation. My brother's best friend is always trying to ensconce himself in our family gatherings, much to my annoyance. I ensconced myself in the airplane seat and tried to take a nap.
ensconce oneself in something
Fig. to establish oneself in something; to settle oneself into something; to place oneself firmly into something. He ensconced himself in the most comfortable chair. Sally ensconced herself in the huge throne and pretended she was a queen.