When Dawn was going through all those changes, Xander was the one who made time to talk to her, showed an interest, etc (Buffy was always too busy...); then after Dawn got back to normal, the two of them bonded even more over being the only two non-superpowered people in the Slayer Army, and eventually Dawn told Xander to stop wasting time and just kiss her already, dammit. (Or words to that effect).
Of course this happened just before Buffy searched her heart and realised she kind of had romantic feelings for Xander too. In the Jossverse the course of true love never runs smooth...
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When Dawn was going through all those changes, Xander was the one who made time to talk to her, showed an interest, etc (Buffy was always too busy...); then after Dawn got back to normal, the two of them bonded even more over being the only two non-superpowered people in the Slayer Army, and eventually Dawn told Xander to stop wasting time and just kiss her already, dammit. (Or words to that effect).
Of course this happened just before Buffy searched her heart and realised she kind of had romantic feelings for Xander too. In the Jossverse the course of true love never runs smooth...