This made me think about how sociable Deku is; he goes out with quiet people one day, two girls another day, a woman in her forties and lively people another day.
He'll have to engage in and interact with many different conversations and vibes
I was thinking about these pics izuku took,maybe because of their busy schedules they don't find a chance to all meet at the same time so when one of them becomes free he meets with those who are free in separate groups at different times
So yah izuku hang out with momo and sero