Ben Trovato!

I woke up this evening cold and blue
The winter snow betrayed a warm home and i was too insensate to move
Oh, when i got up my veins all descended into the marrow of my bones in an attempt to expedite the flow
Still, my circulation began to slow

Just then a giant leech spoke out to me prospecting about the future and whether I’d entertain compliance with a symbiotic alliance
…just before i hit the floor and passed out

Come closer, sit down
Fold my sleeves back, and you'll see that I'm not hallucinating

“Just one taste of our mutual trade and you'll appreciate your sentience renewed
But when I'm satiated by your generous aid and you're thoroughly drained, then you and I are so through!”