LunaMaria: MC used Cecil as bait to taunt Lars, they make a bet to a duel if Lars wins MC will release Cecil, if Lars lose LunaMaria will become MC's slave. Lars lost horribly and she becomes MC slave. In the last volume we get to know that she probably is in love with the MC.
Miro: MC kidnap her, eat her soul (he eats souls by kissing his prey). Then they make a deal, she will make the party disband to separate Lars and Iria, so she gets to be with Lars. Fast-forward she separate Lars and Iria and stops being in love with Lars and falls for the MC.
Iria: She left Lars in the city to go back to their village because of a pandemic. The MC takes advantage of this goes to their village first with medicine and gains the trust from everybody in the village, later the village elder ask them to investigate because there have been sightings of orcs near the village. Both of them go to investigate and found about 100 orcs, MC paralyzes her and tell her that there are too many, so he is going to ask for reinforcements, and she needs to be the "bait" uses light magic so the orcs notices them and tells her that orcs uses females to mate (like in Goblin Slayer) so if she doesn't move she will probably live. She asks for forgiveness and pledge loyalty to him.
Lars: he doesn't realize anything and pretty much is training in his village after being sick because of the pandemic.
In the last volume the MC is going to the island after Kuraia, Klimt and Goz tries to kill Suzune because Kijin are the servants of the demon sealed near the island.
The MC didn't want to know about the island but now they know he is with a Kijin probably assassins are going to come after her, so she takes Kuraia as a hostage after defeating the three of them and tells Klimt and Goz to tell his father that Suzune is a good Kijin and that if she becomes evil he will take care of her.
He really doesn't care about the people on the island he just wanted affection, he trained hard and once he was vanished nobody showed sadness, the siblings who took him were like "oh you're leaving the island bye" so he wanted to be a famous adventurer to show them he wasn't worthless