T'Challa had been informed of Tony's inability to play well with others (alongside his disregard for orders in the field, his alcoholism, his ego), and had seen for himself several times that Tony seemed to go out of his way to aggravate those around him.
But unlike the professionals that S.H.I.E.L.D. had lined up in front of him to give him such warnings, T'Challa could see how tightly Tony held on to the ones who didn't leave. James, Virginia and Harold were the first three that came to mind, standing firm as Tony's defenders when the world sought bring the man of Iron to his knees. There were of course others, usually those who employed a similar if not identical form of defence; Hawkeye, Spiderman, Captain Marvel, all souls who Tony held in high regard.
Of course, Tony was most at ease amongst those who could identify with him on the academic plane.
Bruce Banner, Reed Richards, and even T'Challa himself were treated to a higher level of respect among Tony's associates due entirely to their ability to keep up. It actually caused a pool of sadness to well up in T'Challa's mind as he thought on how lonely Tony's youth must have been, ostracised by his peers not only for his youth and wealth, but his superior intellect.
"I totally made him do it! He may say it never happened but it did; I got him to do it!"
"You got me to do nothing! The mission has been completed and that is all they need to know!"
And of course, T'Challa thought with a smile on his lips, there were those that Tony got joy out of pestering into friendship.
Such as Stephen Strange.
The relationship between the two men was something that many thought dangerous, if not outright impossible. With Tony's blatant distaste for anyone of/for magic, and Strange's blatant distaste for anyone... well, not him, the two getting along as well as they did was something spoken about in awed whispers.
Given Tony has gotten Stephen to raise his voice outside of battle, causing the stoic, unflappable sorcerer to lose his veneer of mystique, it is likely the younger Avengers will be following Tony around like ducklings for the next few days.
The image of Tony wandering around with Spiderman, Wiccan, Hulkling and Patriot shadowing his every footstep brings a gentle chuckle from T'Challa's throat.
"Heya Leopold! I got Strange to do it! Even though he said he wouldn't!"
T'Challa wraps his arms around the man now beside him, holding Tony close to his chest, revelling in the feel of his boyfriend's body against his.
"Yes, I heard. As did, I assume, the majority of the mansion."
Tony laughs as a strangled noise escapes Stephen's mouth. T'Challa smiles and pulls Tony ever closer.
All is well.