Disclaimer: Don't own 'em. Don't think I want to either.
Quick scene I thought of when I saw a Dawn's real dad Challenge

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“What do you mean she’s my daughter?!” Xander asked, shocked.

“Well, we sent some of Dawn’s blood away for a DNA test to see who she was created from, and she’s half you and half Buffy,” Giles explained patiently.

“But, but, but,” Xander sputtered, “Wait, that means my DAUGHTER has been crushing on me since before she has existed!” If possible, it seemed that his face managed to get even slightly more pale at that realization.

“At least be thankful I’m not asking you to pay child support Xander,” Buffy said with a laugh. “What I will make you do though, is break the news to her. We all want to see what happens when she realizes she’s been crushing on daddy dearest.”

“You’re evil. And HEY, that’s my daughter you’re laughing at!”

“Yeah well, she’s my daughter… sister… daughter? Oh my God, we just need a banjo and we’d fit in perfectly in Deliverance.”

Xander just hung his head.