>Lovecraftian backdrop for the setting than Ruinous Attraction would have had on its own.

The plot of both stories is pretty simple. Lbr, Oviposition is barely more that PWP, and most of the story in Ruinous Attraction comes from the interplay of the characters - the plot itself is pretty basic: they're trapped in an enchanted room that's making them increasingly horny and they do it. It's the characters histories, personal circumstances, and initial animosity that makes it interesting.