They have been found out by his sister and she sweetly wishes them good luck and says she will keep their secret
Them: "What secret?" "Who knows..." OMG I CANNOT WITH THESE TWO IDIOTS It is normally a wholesome and cute part of the story when a family member is supportive BUT THEY DID NOT EVEN UNDERSTAND THAT THEY WERE BEING SUPPORTED AHAHHAHAHA my cute oblivious idiots