Someone help me find this bl manga I've read it 5 years ago I think so I don't quite reme...

Someone help me find this bl manga

I've read it 5 years ago I think so I don't quite remember. So the couple's probably childhood friends and the seme probably made a promise saying hell marry uke or smth. And then he knocks in the uke's house, the mom probably opened the door and called the uke out and the seme had like probably flowers and said marry me or something. Then he spilled that he changed the laws of their country so that they could marry each other legally . That's all I remember