Up until the storage room, I was like, wow, Sakie handled this well, like an adult would. Ryuichi managed not to stick his foot in his mouth and was able to keep up his end of the bargain. Shizuna, I thought at the time, had only picked up on Ryuichi's use of Sakie's first name. It was kind of unreal, but they minimized the drama and no one is wrecked.
Then came the storage room scene--that she can find Ryuichi shows she too has some stalker skills. What she said to him started off mature, it was refreshing to see a teen being able to cope well with what is frankly an awkward situation. However, she kept talking and now I see more red flags waving than in a Chinese parade.