Youkoso! Sukebe Elf no Mori e

Yuichi 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 Yuichi be able to survive this bountiful land of gratuitous elven sex appeal?