This is very much like your contact name on his phone and vice versa.
***

Italy Veneziano:
Feliciano: Mi felicitá
You: Sweetheart<3

Italy Romano:
Lovino: Mi dolce pomodoro~
You: Lifetime

Germany:
Ludwig: (Name)
You: Cinnamon

Prussia:
Gilbert: Trottel :P
You: Dork Xb1

Japan:
Kiku: Maka
You: Soul19

England:
Arthur: Infinity ∞
You: Eternity ∞7

America:
Alfred: Sunshine
You: Sky

Russia:
Ivan: Snow Angel
You: Snowman3

Canada:
Matthew: Summer
You: Winter
•••
Shout out to ! She was the one who requested this! I'm already doing the 2P chapter and the Cuddling chapter, so it might take a while for the next update!1

06/29/2016: I polished it and changed it little!
XOXO,
HetalianTomatoFairy