Bai's poem is a single sentence, and it carries a whole tangle of feeling. The speaker says they wrap someone up like a blanket, which sounds warm and protective, the kind of comfort you'd want on a cold night. But the sentence doesn't stay cozy for long. The speaker holds the person so close that they fear the person might suffocate.
That turn is the heart of the poem. The speaker clearly loves deeply, yet is aware that love can become too much. A blanket is meant to comfort, but a blanket pulled too tight can smother. The speaker seems anxious and a little guilty, caught between wanting to protect and worrying about doing harm.
The mood is tender but uneasy. The short length makes the confession feel quick and honest, as if the speaker blurted it out. It leaves us wondering whether they will loosen their grip.