The Shadow of My Entity

I find your will to live unclear; you move without your own consent; though, to my motion you adhere: with that, my friend, are you content? You have no features to discern; yet, for the denizens who try to diagnose your form, you turn invisible to all but I. At times, not even I can tell if you reside beneath my mass, your stubborn dusk commixed with wells of shade that every object casts. But sure enough, you tightly clinch my heel, the vertex of our pact; like ink, you empty inch by inch onto the ground, with bond intact. Am I to fear the day we part? What would I lose if it should come: the mortal feelings in my heart, my sense of equilibrium? I find it rather hard to deem the value of your cryptic guise; however, it would surely seem your umbrage doesn't harbor lies. If it is temper that you yield, then by all means display your shade: my flesh shall be your house and shield, my spirit, your substantial blade! I will not live this life in vain, the life that you refined for me. My friend, will not you please remain the shadow of my entity?