This is the providence of nature!

Orcs have few females, so they use elves to multiply their brethren.

In this story, captive elf Aslin is "gifted" to orc warrior Mokkos for 2 years.
He may have her exclusively for that time, and his duty is vital: to make children.
After those 2 years Aslin will be offered to all the orcs for further breeding.

Be a man (orc!) and make Aslin your obedient slave!

[From DLsite English]