Success route nothing really happens and the MC never really advance his rank.
On failure route though.
Between her pride and naivete, she keeps falling for the guy's trap and get exploited further (with the 2nd quest her promising he can do whatever he wants and he demands anal sex, and 3rd quest he demands she becomes his permanent partner...in sexual sense too of course)
The hilarious thing is that, after she failed the 3rd quest and he's about ready to go, he ends up promising that he'll do her 'after completing' a quest.
So they went to the conga quest, crush it under 1 minute (the girl points out that he's using Hunter's Knife (a starter weapon for those unfamiliar with the series))
So as promised, they had sex.
Some time later, in the fella scene. I believe the guy basically said that he'll actually bother with raising his (and hers as a result) ranks.
Then the outtro is something like the guy proceeds to become famous, and every night the girl's moan can be heard.