He is probably placed here to potray the "boy" while mc is THE "MAN"Maybe it's just me, but I feel like the guild girl was grooming the top A-rank adventurer. Like, yeah he has a group of skimpy ladies with him but he doesn't feel like a bad guy.
It's a speech tic. Like how cat-like expressions are added in at the end of words (nya, nyan, etc.). Though this time, it's a bean (mame).Is the “mame” supposed to be a suffix?