You may be saying from the title, "What? Why are they getting married? I don't understand." Don't worry, it's okay, you're not going crazy. This episode made me very confused as well, before I knew the entire plot. But it is a very good episode and one of my all-time favorite episodes from this season and the entire series.
In this episode, Willow has been very depressed since Oz left. So, to make herself feel better, she casts a spell on herself, that doesn't work the way she wanted it to. It's a will- be-done spell, but when she can't command herself to get over the pain, she gets even more upset. But when she says that Buffy and Spike might as well get married, that Xander is a demon magnet, that Amy was a perfectly normal girl, and that Giles can't see anything, things go bad. Buffy and Spike get engaged and make out all over Giles' apartment. Xander and Anya gets massive amounts of demons flooding them. Amy turns back into a human for a second, but then Willow says, and then she's a rat, so she turned back into a rat. And Giles goes blind. Her will-be-done spell, worked. It's so funny, it really is. Especially when Anya's ex-boss, D'Hoffyrn, wants to recruit Willow to be a Vengeance Demon.
Overall, I give this episode a 10 out of 10.
In this episode, Willow has been very depressed since Oz left. So, to make herself feel better, she casts a spell on herself, that doesn't work the way she wanted it to. It's a will- be-done spell, but when she can't command herself to get over the pain, she gets even more upset. But when she says that Buffy and Spike might as well get married, that Xander is a demon magnet, that Amy was a perfectly normal girl, and that Giles can't see anything, things go bad. Buffy and Spike get engaged and make out all over Giles' apartment. Xander and Anya gets massive amounts of demons flooding them. Amy turns back into a human for a second, but then Willow says, and then she's a rat, so she turned back into a rat. And Giles goes blind. Her will-be-done spell, worked. It's so funny, it really is. Especially when Anya's ex-boss, D'Hoffyrn, wants to recruit Willow to be a Vengeance Demon.
Overall, I give this episode a 10 out of 10.