Nikky's "Him and I" is about being controlled by someone who returns again and again in the dark. The speaker never says who "he" is. The cold hands and the "bite" could point to a vampire, but they could just as easily stand for an abusive person, and the poem leaves that open.
The speaker's main feeling seems to be helplessness. She closes her eyes and retreats into her mind, as if she can only cope by not being present. Even the word "bend" suggests someone who has stopped resisting and now gives way to his "every will" and "every motion." The last line shifts to "you," and the "sick thrill" is unsettling. It hints at something twisted, either that the speaker feels a guilty pull or that the one in control enjoys his power.
The mood is dark, claustrophobic, and uneasy. Short lines and repetition make it feel like a cycle she cannot escape.