You know what, i still think she after the big brother. As you see, she play it slow and safe, then when MC feeling at its peak, she will drop the freaking bomb asking to visit his house and be introduced to the big bro. Then, she will slowly ditch MC where at the same time close the gap with big bro. Final blow will be she openly flirt with big bro and completely ignore MC all together. At that time MC will fall into the abyss, the void, and got pull by the great attractor to the nearest bridge..... and then he wakes up, eat breakfast and go to school.