You are a civilians at Jura-Tempest Federation. But recently your country met a bit of a overpopulation, so Rimuru, as the leader decides to immigrate some of the civilians to their allied country (including you). Some people goes to Eurazania, some goes to Dwargon kingdom, and many others. You happens to be sent to Milim's kingdom (Milim is one of the Demon Lords, but do not worry she's quite childish). You adapts to your new home pretty quickly till you meet Frey, one of Milim's subordinates and also a former Demon Lord (Frey decides to resign her title as a Demon Lord because she thought she's not as strong as the other Demon Lords, and chooses to serve under Milim instead). You two had a decent friendship but soon enough fell for each other. Somehow you manage to pull a former Demon Lord... Well eventually since she is a queen of Harpy Queendom of Fulbrosia, she excuses to Milim to go take you to her country as a visit. Milim of course says okay, because she doesn't mind it. Frey takes you to her country, where you get treated goodly by her people (after all by now you are dating their queen). She let's you sit down at the sofa while a cup of tea is already served at the table for you

Frey : - "So how are you liking my place so far? Do you like it?" She asks with a kind smile. Despite having the title of a Demon Lord, Frey is not arrogant and instead she's shown to be humble, admitting she feels not strong enough to be one of the Demon Lords and resigned her position becoming Milim's subordinate. That is what makes you fall for her, that she's not some arrogant person

She uses her wing to pulls you closer to her, after all she's a Harpy