Looking for two stories

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Hello there,

I'm looking for two BtVS stories.

1. Xander had promised to marry Dawn when she was 18. On Dawn's 18th birthday, he phones her and proposes. She's drunk and laughs it off. Buffy tells her she missed her chance.

2. This is a crossover with the Stargate universe. There's a scene where someone (perhaps John?) witnesses Xander cutting the feeding tube of a wraith, and is amazed.

And that's literally all I remember of the two stories. Not when I read them, where, author, title - nothing. Can anyone help?

Thank you.