Oh! Holy manga summary:

Pairing: Sweden x Finland From Hikari_Kaitou: A conversation with Estonia makes Finland realize how terribly lonely it must be for Sweden to have to spend every Christmas alone while Finland does his Santa duty. He rushes home on Christmas night, hoping to surprise Sweden with his early return, but finds that Sweden has gone somewhere. As Finland spends the last few hours of the 25th alone, waiting, he begins to feel really guilty about having left Sweden to this fate all these years.