Youkoso! Sukebe Elf no Mori e, hentai anime based on the visual novel by Lune. First episode released on February 2nd, 2018. Made by studio T-Rex. Duration 16 minutes. The character art is based on illustrations by Aoi Nagisa. There are two episodes available as of time of writing. A third episode is under works.

Edited synopsis quoted from DLSite:

“Alfheim, a world of elves where only women exist. The world Shrine, the source of all the elves’ magical power, has started to fade. The elves are in danger of extinction. Their only hope is a prophecy of a man with a big penis from another world who will become the savior of their big buxom butts.

The elves believe that in order to save their race, they must make children with the man from another world. Many refuse. The girls divide into two groups: Those who abstain from making babies with the guy, and those who consent. The girls who end up having sex with him soon discover their magical powers are increased when their bodies collect his seminal fluids. And thus, the luscious elf babes proceed to milk him dry…”