It's that heart-clenching feeling when you want something so badly.
It's the ache you feel right down to your bones when you feel a part of you is missing.
(how could you miss arms you've never felt?)
The pain, the longing just has a way of eating you from the inside out, until all that's left is a hollow body.
Just a living being wanting, wanting to feel that semblance of warmth, of love.