The poem is built around a quiet, uneasy image: a man licking his lips as he stares at a box whose contents he can't see. The title, "Damned If You Don't," hints at a trap, where every choice carries a cost. Then the poem shifts. The last two lines speak directly to "you," and suddenly the box seems to stand for the person being addressed.
The speaker's tone is wary and a little resigned. "It's hard to pull off" suggests an effort, perhaps keeping up a front or staying closed off, and that effort is what "keeps you safe." Safety depends entirely on him not unwrapping you. The poem doesn't say who he is or what he wants, but his hunger is clear from the first line.
The mood is tense and predatory, with a feeling of waiting. Because the poem is so short and plain, the threat feels quiet but constant, like something you can't relax around.