Main post.
D. Gray-man:
The Mission - Allen/Lenalee.
Axis Powers Hetalia:
Melt me slowly → Switzerland/Belgium.
Boys will be boys → Prussia/Belgium/Denmark.
A long road → Spain/Belgium.
Reunion → Denmark/Iceland.
The Good and The Bad → Prussia/Germany.
Prussia/England → Tease.
A list of things Belgium shouldn't do.
DOGS:
Heine is possessive → Heine/Naoto.