Friend in need, huh.

Haha, I did the same as Yukarin when one of my closed friend told me that she was going on diet.

Of course, I got a slap. XD

To be fair, Yukari has only just shown up. She may not have known what was going on.

Bigger question: what are those two osayukkuri doing...

FoolyDooly said:
Bigger question: what are those two osayukkuri doing...

Eh, they're just bowing to each other in greeting.

As far as I can tell, first meetings between osayukkuri, or between relatively competitive ones, results in a race. More benign meetings afterward tend toward being fairly formal/polite, such as here.