He promised his pals to find a solution for their temptation problem and taking her himself he did just that. They should praise him for it, but I†˜m pretty sure they will beat up this lucky bastard...
Hmm, I mean, by taking her for himself, he's pretty much solved their problem? A win-win situation, I suppose, though I doubt they'd see it that way once they find out what happened.
And hey, in the end, by being asked to take responsibility for what he did, he also got himself a cute wife. So it's all good.
Luna-sama used: "Aura Of Enchantment" (or something like it) ... very few 'healthy young men' could hope to withstand it for long.
As for Jin-kun, she used the dangerous (almost) forbidden technique: "Ero-Entrapment" ..... IT'S SUPER EFFECTIVE! See Jin go "beast mode" in a few seconds, and Luna-san seemed to like it very much (say-no-more, say-no-more).
Conclusion(s): (1) At least in the H-Universe, 'Martial' Arts are no match for 'Marital' Arts (2) Artist's Debut on FAKKU is ... wait for it ... APPROVED!