Well, it might be about how the shrink and the neighbor's paths first crossed. Maybe they met at a local event and the shrink's professional identity came into play right away. Or perhaps the neighbor had heard about the shrink through the grapevine and approached him with a problem that was the start of this whole story. It could also be about the setting where they live, like if it was a small community where everyone knew everyone, which affected how their relationship developed from the very beginning.
One back door abortion story could be about a woman in a country where abortion was severely restricted. She was desperate as she couldn't afford to have a child at that time. She found a so - called 'back door' option through an underground network that provided unsafe abortion services. It was a very risky situation for her health and she ended up with serious complications. Fortunately, she was able to get some medical help secretly later, but it was a harrowing experience.
It's not impossible. Manga creators often come up with unique and surprising twists, so the boy next door could totally be a vampire. It could add an exciting element to the story.