I think this is the whole song and dance we're going to be getting from this manga honestly. A request comes in, these girls go about their own pace dragging the mc around against his will, they somehow manage to complete it all the while he does mostly everything because he's used to being the assistant, and in the end they say "good job assistant" and pat him on the back while he tries to maintain the "i'm not an assistant" vibe.
I know none of the girls are really at fault but they're all kinda self-centered aren't they? maybe one day they'll realize that the guy they like and dragging around shouldn't be treated as a handmaid or helper when he doesn't really want to. Maybe they'll respect his feelings? I highly doubt it though. He's probably going to admit later on he enjoys being an assistant and being around these girls or something.