Unthawed

I
Unfold
A missive
From my cherished
one

Joy
Jumps forth
In my heart
Overtaking
Me

He
Melts this
Once frozen
And unbending
heart

for {item: 2139468} March 2018 Taboo words contest, 2nd Place.
Line count:  15

The Lanturne is a five-line verse shaped like a Japanese lantern with a syllabic pattern of one, two, three, four, one.
taboo words:
letter 
pen  pen
paper 
dear 
mailbox/ letterbox 
  penfriend 
note 
envelope 
postage stamp