(Male) Protag-kun unknowingly unlocked the "me-so-horny / threesome" route ... and by the end, it seems that (at least for the girls) 'once is not enough'.
Well, life certainly threw him a bone, eh?
Great ending though. At least he was trying to be nice and telling them to stop doing this...And it's great that they listened to him, considering what they said at the end. Heh, he doesn't seem to understand what they mean by their words in the last panel, so yeah, a little dense...But that's fine too. The two of them can rely on him from now on, and he can rely on them too...While he looks for a better job.