Ruth asked Boaz to spread his wings over his servant, because he was a redeemer. The request is stated directly when Boaz asked who she was. This exchange is in Ruth 3:9.
At midnight Boaz wakes up suddenly and realizes someone is lying at his feet (Ruth 3:8–9). Startled, he asks for the person’s identity. Ruth identifies herself plainly as his maidservant and then makes a direct request: that Boaz cover her with his garment. This scene continues the threshing-floor plan introduced just before, where Ruth approaches Boaz at night after he has eaten, drunk, and fallen asleep, and she lies down at his feet (3:1–7). Verses 8–9 are the moment of first contact: discovery, identification, and request.
Boaz wakes in the middle of the night, startled, and discovers a woman lying at his feet (explicit: Ruth 3:8). The scene is narrated as surprising and tense, but the dialogue stays short and controlled.
A careful answer keeps the immediate passage, the book's argument, and the whole-Bible storyline together, so the question is answered in context instead of as a detached idea.
Start with Ruth 3:9, then read the surrounding section so the answer stays connected to the passage's flow.
9He said, Who are you? She answered, I am Ruth your handmaid: spread therefore your skirt over your handmaid; for you are a near kinsman.