@BalrogDeMorgoth on the previous chapter she pretended to be afraid of him because she thinks he is stalking her, sort of like "I'll wait for him to leave before i do" she not pretending to be surprised of him been outside his own home. On this one she is pretending he followed to her school...
Sounds like prostitution but with extra steps.
Now seriously, if she has a crush on MC, there are less creepy ways to go at it. She could ask her to have lunch together or walk to/back from school together.
That's a really sneaky one. If you look at the mom's pants, you can see they are wearing diferent pants, so the first kid with a ballon was a real kid.