Understanding

Peter was nervous and flustered the whole flight to Germany, seeming as though he might faint before they even boarded the jet. All it took was the Stark Industries logo on the side to wow him, Tony thought with a smirk. Adorable.
He seemed nervous as they began to lift off and Tony realized he had probably never flown before.
He popped open his bottle of champagne and grinned at the kid.
"Stark F-20 model. One of the safest in the world. You're flying first class sweetheart."
As Peter's cheeks flushed up from the endearment, Tony knew exactly what he was masturbating to tonight. God, he was like a horny 16 year old all over again. He couldn't remember the last time he had jacked off; he never had to; he could have drugged up orgies with Miss Universe models whenever he got horny. But they weren't his Peter.
First time for everything, he supposed.

Coughing up yet another fistful of blood, Tony Stark stared out the balcony of his tower onto the city below.
Bringing Peter to the airport had been a mistake. Peter struggling to hold up the shipping container. Peter slamming through the glass windows. Peter lying scared and disoriented on the ground.
Tony was going to kill Captain America. Perhaps not literally; the man was a national icon after all. He had to keep him smiling for publicity. But he'd break him, and make sure he never could hurt the boy ever again. His boy. Peter. Tony smiled.
"Friday, hunt down and capture Captain America. Use as many suits as needed. Bring him to me." Tony grimaced as another cough of blood interrupted his order. God, he thought, I need a drink.

He began to make preparations for his Peter in a haze of oxygen tanks and thoughts of Peter in various states of undress.
What should have suprised him, however, was the domesticity of many of his desires. He longed to take care of Peter, to comfort him and coddle him, like a husband or father. If Tony were a better man, he would have considered the implications of taking on both of those roles. But he wasn't, so he didn't.

He dedicates a whole wing of the tower into crafting a home for Peter. A place to welcome him, make him feel as though he belonged.
Peter didn't really belong with the avengers. Not at all really. The avenger offer was a guide to bring the boy safely into his arms and bed. He'd include him in publicity photos nd such, but Peter would be strictly kept from actual risk.
The Avengers had good public reputation, but Tony knew all about the illicit drugs and sex and parties behind the scenes. He fondly recalled passing out from one too many ectssy pills and waking up to a severely drunk and high Natasha humping him as Clint lazily played with an arrow in places no sharp objects should ever touch.
They were all people whose concern for the public was a fake, pretty venear to their actual persona. Much like the rest of the world,and Tony thought, but with the added virtues of beauty, money, genius and fame. Everyone else was inevitably forced to obey, not that they deserved any better. Survival of the fittest
Tony was the epitome of these things, he knew. He was arrogant, but far from naive.
Ultimately though, Tony was a god on Earth with the power to play judge, jury and executioner as he pleased. And he knew that Peter deserved so much better than the rest of the filthy world could give him. The world would hurt his innocent, beautiful boy unless Tony hid him away in a gilded cage with sweet kisses and honeyed words.
Or perhaps, even worse, the rest of the world would realize how special his baby boy was and get to him first. Perhaps, a traitorous voice whispered in his head, you are keeping him not because the world would hurt him, but because the world would try to claim what was yours. To the voice, Tony grins and replies that it wasn't important which was true. Either way, Peter belongs to him. The world revolved around one Tony Stark, whether it realized it or not, and he would make sure that soon, it would revolve around Peter too.

In his haste of preparations and recovering from assault via vibranium shield, Tony admittedly had neglected Peter. Of course, he only realized this when Peter was put into danger by that batshit bird-man, leaving Tony with no choice but to confiscate the suit. His boy had cried, and Tony's long-lost heart nearly shattered at the sight. He wanted to take Peter into his arms and tell him it was alright, to show him pleasure he had never felt before, tell him that he was something, everything to Tony.
But he couldn't. His plans were nearly ready, but not yet. In the meantime, he made sure the
Vulture suffered a grisly death at the hand of another petty super villian. Having various automated villian suits on call was certainly a good investment. Sometimes, he mused, being the good-guy Iron Man simply doesn't get the job done.
And finally, when all his preparations had done, the boy had declined his offer with the idea of remaining a "friendly neighorhood Spiderman". It was his obvious inferiority complex, Tony realized. Of course, loving subservience to Tony was ideal, but not like this. The poor thing. Well, he supposed, he'd just have to make him understand.