Errr.. She's not really a prostitute tho, is she? I mean, she just pretended to be an anonymous customer of him, forwarding him the link to her own fake "health delivery" service, with the hopes that he'd call. And he did. Also, I just noticed I didn't see any financial transaction happening. In the west, you just give the girl the money before the action happens, does it work differently in Japan?
I'm probably overthinking it. I mean, the art's decent, I suppose, but the weak point is the story thus far. Like, here's got to be a better way to get the guy you used to ignore in school, right? Wait... why's she into him again? Because he "has a dream to make manga"? Women aren't that easy.