In this case, the author parodies the akogare and doshiai stuff from the culture of Japanese women's schools, which can also be seen in works like MariMite or even Revue Starlight. The parallels with gay stuff are obvious, but if you compare it with how manga as a whole depicts a canonical romantic attraction, you will realize that this is not one of the romantic subplot. In any case, this conversation is meaningless, as in more recent chapters Kei herself speaks directly about it.