The fallout from the entire Eurus situation was impossible to ignore, though Mycroft would have very much liked to have done so. It was something he had hoped he would never have to deal with, but alas, despite his years of preparation and careful coverups, he found himself with the cat out of the bag and an utter disaster on his hands.
It was, at least, successfully contained again - quite literally so, in this case. With Eurus safely tucked away and not wreaking havoc upon the world, Mycroft could focus on the secondary problem of his family's reactions. His mother, of course, had castigated him for hours. She felt betrayed; he understood that. The reaction was unsurprising, really. While he did love his mother, she had always shown a certain level of blindness when it came to the reality of her daughter.
Sherlock, on the other hand, had shown some understanding. Was that also unsurprising? Mycroft was not quite sure. His brother did so love to cause conflict but, at the same time, if there was anyone else who understood why it was preferable to have his family believe their sister was dead, well, Sherlock would be the one, wouldn't he? Considering that, it perhaps made sense that out of everyone, he had been the one to defend Mycroft's actions.
He'd been incredibly touched by the defence. In that moment, it had felt unexpected. Of course, Mycroft couldn't say this aloud. Such overt sentiment was not standard between the two brothers.
For a similar reason, he also couldn't explicitly admit to why he had invited Sherlock to the RAC in Pall Mall for dinner. He wanted to check in on his brother, but he also wanted to do it on neutral ground. The club offered the advantage of being formal enough to promote good behaviour, while also being private enough to allow for conversation and, perhaps most importantly, did all of this while not being the Diogenes, which was out of the question as a location when Mycroft was attempting to make a show of not pulling a power play.
That being said, the Diogenes was only a few doors down. If everything went wrong, it did still provide Mycroft with an easy escape. With some luck, though, dinner would go smoothly. That did sometimes happen with Sherlock, albeit only once in a blue moon.
Having asked the staff on the door to show Sherlock to their table in the dining room when he arrived, Mycroft waited for his brother. He took the opportunity to order a bottle of wine for the table, which had only just been poured out by the waiter when his brother entered the room.
"Sherlock," Mycroft greeted, standing politely as he motioned for him to take the chair on the other side of the table. "It is good to see you. I'm glad you could make it."