God! You just have to love bitchy teachers reluctantly giving into a gangbang. And even though she's enjoying it, she complains the whole time, which is even better. Itoko Sensei is my favorite lady from this anime (and there isn't nearly enough of her in it) so I was really happy to see this one kept her (mostly) in character. Especially since she kind of disappeared part way through the series.
Of course, Youko Sensei shows up even more infrequently. But at least we have this story.
As for the "to be continued...?" ending. Sensei doesn't really continue it (unless I missed it when I was searching). But he does give us a flashback in a later book that includes a couple pages of Yoko gangbang goodness. I'm planning on posting it in a bit. Look for one called "Another Ending".
For those who are wondering (probably no one noticed) I cut the short tentacle story at the end (it's a completely different story and doesn't effect the main story).
With that said, "Forest of Men" is a complete, self-contained story (at least as far as the artist released it). I'm treating this like a collection of 2 stories. Hence the slight title change.
Interesting fact, sometimes people tag this sort of thing as incomplete (even though the story presented is complete) and sometimes they don't. I stumbled across that situation while looking for more of this story.