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How terrified of Unohana's teacher must Urahara be that he never caved in under the pressure of Unohana's smile-threats and taught her to make the hot springs? If this is the something separating her from reaching her mentor's level, I can imagine that she could be quite forceful (in her own way) in wanting it from Urahara.
Even if she didn't know about it, I'd be surprised if he didn't use it to appease her at some point in his career.
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