She was probably just not very fond of the other costars, she probably did do it with other people but she just liked Masaki the most (I love this chapter :D)
This chapter really made me feel like they were worlds apart, even though in the end they still went home together i felt kousaka was kind of jealous because hes just a clingy boy c:
I say it wont be yuri and theyre just close friends but yoshida should have the dad role and find some other romantic interest other than kouhai and gotou, id prefer that