Sarah's "why i stay" is a short love poem built around a question the speaker keeps being asked: why do you stay? The speaker answers by listing small, specific things rather than grand declarations. There's the smile, the laugh, and the habit of pulling a bottom lip between the teeth when confused. The last detail, the way two bodies fit together, is the most intimate.
The question could be read in different ways. Judging by the final lines, the person being addressed may doubt that they're worth staying for, or may wonder whether the speaker is trapped. The speaker's reply is calm and steady: the answer is "always the same." That repetition suggests they have said it many times and will say it again.
The poem ends on a heavier note. Saying a world without this person is one they "just don't want to live in" turns tender affection into something close to total dependence. The mood is warm and devoted, with a quiet seriousness underneath.