In what might actually officially be THE most fucked-up Undertale fanfic of all time, putting even the Alphamalg series to absolute shame, Asriel (after watching quite a bit too much Alphys VS Undyne) decides to reenact the giantess scenes from said television series...only with him and Toriel!

Needless to say, things get really REALLY fucked-up really REALLY fast. Trust me, the title is literal with this one.