Sherlock came out of his room wrapped in his bedsheets. There was an email from his brother.
My house. ASAP.

Sherlock grinned.
"John, pack your things!" He yelled.
"What, why?" John asked.
"We're going on a trip."
Sherlock refuses to say anything else aboutthe matter. He didn't bother getting up from his chair, and just sat there watching John hurry around, getting everything he needed.

"Oh, did I forget to mention that you won't need to bring anything?" Sherlock said. "They'll have it delivered."
John sighed and pinched the bridge of his nose.
"Well, you better change, Sherlock."
"Why?"
"Because we're going on a trip! You can't just waltz everywhere in your bedsheets, people will talk."
Sherlock rolled his eyes.
"It's fine John, so stop worrying!"
"Oh, Sherlock, there's a car outside for you. They say it'sto your brother's house?" Mrs. H said, peeking in the door.
"Ah, yes, thank you Mrs. Hudson, tell them I'll be there shortly please."
"Oh, Sherlock, you better change them. You know Mycroft doesn't like you wearing that everywhere."
"Mycroft? Who said anything about Mycroft?" Sherlock then walked out of the room, leaving both of them baffled. John rushed after him.
"You have another brother?" He asked.
"Half brother. Same mother." Sherlock replied.
Sherlock opened the front door to reveal a limo.
"We're going to the private jet, my brother is in America."
Sherlock got in the limo without another word. John gave a loud sigh of frustration and stormed after him.
The inside looked luxurious. It looked more comfortable than his house. There were two small beds in there. John was in awe. (This is what I imagine Tony would have). He saw that Sherlock had always flopped onto a bed and lay there, staring at John.
The car started, and John sat down on a reclining chair by the bed.

"So whose this brother of your's?" He asked.
"Tony Stark."