Succubus Challenge!

A fierce sexual showdown where two insatiable masters of pleasure clash in a battle to see who can make the other cum first!
Will the human emerge victorious, or will the rookie ace succubus win the day?
It has been five years since he arrived in this other world.
Armed with a boundless libido and a repertoire of finely honed sexual techniques, he has explored the sex industry across the land—leaving countless hostesses utterly undone and begging for more.
Driven by unbridled lust, the legendary "King of Stamina," Halberd, summons a partner—only to find a girl who looks completely ordinary, lacking even horns or wings.
Yet, beneath that unassuming exterior lies a promising rookie recruit from a succubus-staffed pleasure house...

(Source: Melonbooks; translated)

Note: Published in Isekai Rakuten Vol. 5