Okay, I did not know this series was tied to another story from this artist until now. Mrs. Crawford is the woman from the My Dirty Valentine comic. The protagonist in this series is the son of the protagonist in that comic.
Since per usual, e-hentai's rule-lawyering autistic retards think an additional "cover" (that's just a different version of the cover in the more complete gallery) means this one can stay for no apparent reason.