Sensei realized he's the kid who confessed long ago. Sensei also realized he's not a kid anymore. So sensei suddenly changed his mind about eating together every now and then, cuz Sensei actually had feelings for the Morimoto kid, and now that he is already a Morimoto adult, Sensei is willing to progress their relationship into that kind of relationship. Lol Excuse my yapping!
OMO! Did it sounded like a spoiler? I'm sorry? But let me tell you, these are all just conclusions from my own assumptionsXXD Nothing of them are shown definite on the first chapter. And you are right, I am a hardcore fujoshi
Sensei realized he's the kid who confessed long ago.
Sensei also realized he's not a kid anymore.
So sensei suddenly changed his mind about eating together every now and then, cuz Sensei actually had feelings for the Morimoto kid, and now that he is already a Morimoto adult, Sensei is willing to progress their relationship into that kind of relationship.
Lol Excuse my yapping!