Welcome! To the Forest of Lewd Elves

Yuuichi our protagonist is on night shift at his normal job in his normal life, when suddenly an Elf appears and whisks him away to "Alfhelm" a magical world filled with elves....who all want his semen! There is a war between the elves and the dark elves over who can procreate the most, will Yuuichi be able to survive this bountiful land of gratuitous elven sex appeal?