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I swear, this manager plot needs to end at some point, right? I liked it better when she was just being an easily convinced slut that will fuck anyone who molested her. Now she practically settled with this one guy. Where's Yuu-chan at if the author doesn't feel like using Ai-chan for fun plots any more?
Other NTR are thin because the guy is barely an existence and introduced purely for the plot. Miray Ozaki's NTR is thin because she wants to do nothing but draw the Manager fuck Ai behind the boyfriend's back.
There isn't one per se. The mangas and the doujins aren't really the same, not that it makes much difference if they were. If you want a starting point though, read the tanks first.