Rapport

I had to do some back-checking on some character designs and do some side-by-side comparisons before I made this statement, but...

This is a prequel to Key's "LOVERS" series. The entire storyline fits right in with what Itaru was talking about at the end of "Turn" and it's too much of a coincidence to not be him. Likewise, Sana at the end of this story matches almost identically to Sana from "LOVERS." Lastly, Sana's house was the final point, though one can say the house might be a tract house.

All that said, I'm confident this is a prequel story.

Just as a reminder for everyone:

This story is a part of a collaboration event by Wani featuring Ishikawa Shisuke, Key, and Higenamuchi where one the aforementioned artists makes the storyboard while another does the art. Here, Higenamuchi did the art while Key made the storyboard.

If it says Key im all in...

Can’t abide by adultery, but still turned out better than most hentai.

Unpopular opinion: her glasses look was better. Sorry... I know I have a problem...

The crossover that gets it right! More artists should do more collabs like this. 

Hmm, this was an interesting one.
The start kind of implies he sleeps around a bit, but he has apparently never stopped loving his Sensei who got married, and this time she came to him because her husband was cheating on her...But rather than hope/expect anything more, he just says she's welcome to come over anytime. So...Yeah, I'd say he never really stopped loving her, because rather than pressure her by asking for more, he's content just being able to be with her like this.
Really, I'd just suggest she dump that cheating husband of hers and be with him instead, but I guess things can never be so simple.
That ending certainly intrigues me though...Possible sequel?

It's rare to read a Higenamuchi where the guy actually seems to have real feelings for a woman, instead of wanting to assert his superiority over her while lecturing her about how women's true nature is to be a slut with no loyalty except to the biggest dick that gets waved in front of her.

...I mean I really like that, but, y'know, it's neat to see something like this too.