Tsunmazo Maou to Pure Ero Yuusha ga Arawareta!

During his quest, he suddenly encounters a female demon.
She oracles: "You are the descendent of the Wind Hero...
Join me and we'll conquer the world together!"
She made this offer to the descendent of the Fire Hero already!
How will he respond? Will he mix his sperm in her womb?
Just then, the beautiful descendent of the Fire Hero appears...
she's equally beautiful... perhaps he should cum deep inside her instead!
The final battle of all time depends on a babymaking challenge!

(Source: dlsite, edited)