ForteGVN said: I thought Yukari cut the house off Gensokyo? Lazy hag she forgot didn't she.
You're an idiot. (yes, I had to get that in)
If you'll read the comic properly, she said she'd cut the house off for the Yuukas' last few moments together. "...it will be just you two during her final moment." She never said when she'd put things back to normal.