Fairy Pairing

‘Park Gyu-chan’ lives a life of debauchery and one-night stands.
One fine day, he gets drunk again as usual and wanders around clubs searching for his ideal partner. He finally meets a beautiful blonde woman with big breasts and spends the night with her. When he wakes up in his bed, holding his head dizzy from drunkenness, he sees a winged man sticking something fierce into his anus. The man introduces himself as the fairy 'Mon' and asks Gyu-chan to save the fairy world... But... "The way to save the fairy world is to cum in my anus?"