OK, that said, I am sure I am about to run over comment length here, but I'll give it a shot, and edit it down. (yeah: by only about 2500 characters, lol!)
You had me going for about a third of the story on whether all the hints about Newlin were actually red herrings. They had that right amount of apparent significance that seems like too easy and makes you second-guess.
"Maybe I'll focus on you. And Ron. He'd love that, I bet," Harry muttered. "Serve you right if the whole damned thing was about us running about the country, camping out." Hermione looked smug. "Don't be ridiculous; that would bore people to tears. Focus on the heroes."
Hee hee hee! Slipping in a little critique, are we?
"Ironic Bloodlines", "No Deaths for the Wicked", "The Manipulation of Puppets"?? lol! Apt titles.
He needed to find the reference and destroy it. After that, he could Obliviate Newlin.
It's interesting how Harry seems to be obsessed with destroying knowledge of the thing, and earlier you mentioned him having an urge to retrieve it and keep it safe. Really the thing seems to be acting like the One Ring on him, it seems to me. It's a big tangled mess, hell for him I'm sure, but rather intriguing for the reader, everything you've implied.
Voldemort used my blood to resurrect himself. In essence, he became my Horcrux, bound by Cedric Diggory's death.
...whoa. I never looked at it that way before. O.o
I'm... actually pretty convinced by the fight between Harry and Ginny. Too often she's made into just this random harpy... this seems rather real.
Harry keened as the building orgasm abruptly halted. "No, you bastard! Come on, fuck me!" "You'll come when I want you to come," Newlin said. He braced himself on the bed and began a series of fast, deep thrusts. "You owe me," he grunted.
OMG this is fucking hot.
"People often have sexual relations before battles," Hermione pointed out, blushing.
ORLY Hermione? lol...
Davies held the Elder Wand, running his fingers over its length. "Does this count as a defeat?" Davies asked Newlin. His eyes glittered with avarice. "Is the wand mine?" [...] "The wand will eat you just like it's been eating me." Harry spat out some of the blood. "It will destroy you." "Is this true, Newlin?" Davies asked. "Don't listen to him, Minister. Circumstance destroyed Dumbledore."
!(*&!(! I am squeeing over how this scene could all be a manipulation intended to lead Davies to his own downfall.
"Young Scorpius Malfoy, anyway. Such a wild lad. Headed for Azkaban, until Newlin bought him his freedom by agreeing to spy on you for me."
Old habits die hard, eh?
Had Snape felt like this, in the end? Hungry, yet hating what fed him?
Interesting concept -- he was probably briefly the Wand's master, wasn't he?
"You want me," Harry whispered. "You have since I was a child. You lied." "Then take what you want. You always do," came the whispered reply. Harry nodded, willing Newlin to be at his side. Newlin stood apart. Harry sighed. Later, then. "Davies." Davies's eyes were wide with terror as he found himself unwillingly walking to stand by Harry.
!(*&(*@! Not noticing that Severus is apparently able to resist while Davies is not?
"When you decide, perhaps our paths might cross," Newlin said. "Until then, I know what I want and I intend to pursue it." He rubbed his face. "Take responsibility for your life, Potter." He Disapparated.