I don't own Marvel. Period!
Prolog:
Tony Stark felt like shit, to be blunt. He'd just finished an important mission with Rogers that just 'had to be done', and ended up almost killing him. He thought, for himself of course, a good break was in order, and he'd bring his girlfriend. Sauntering into his house, he threw his jacket on the conveniently placed expensive chair.
"Welcome back, sir. Ms. Potts left a note for you on your counter, and said that you should read it as soon as you get home." said the computer voice of his...well...computer.
Tony nodded, heading into the kitchen and opening the fridge. His eyes spotted some milk. "And where is she? I need to know if I had any special...paperwork to sign while I was away. You know, finger prints." He took a long, swig of the milk. Well...longish.
"She's gone, sir." replied the computer, causing the geniusto spit out the milk he was drinking. He walked over to the note, which he had just recently noticed, and began to read it. Something was attached to it. "She said the note would hold some sort of key to it, sir."
And that it did.
Tony,
Gone away. No need to try and track me down, you won't find me. The item attached should give you a hint to why I'm leaving. And I'm sorry I didn't let you know, you had Avenger stuff to do.
~Pepper
Tony took off the note, revealing a tiny little white stick. On it...was a plus.