Well I had almost the same concern as you but in truth I was totally honest with Arión (I like this even more), he agreed to help and only had sex with her a couple of times (you can join if you want) and then he returned to the city . It is the easiest obcion to rescue the prisoner.
If you really do not want Arion to have any contact with victory, well, I suggest you increase your resistance (the statistic below intelligence) which is the one that allows you to last more rounds (you can buy equipment to increase the statistics is easier) .