The Unexpected Arrival 4 (Parent!Lock)

John hurried out of the supermarket, trying to protect the shopping from the heavy rain. He ducked under a bus shelter to sort out his coat when a large black car pulled up. The phone in his pocket buzzed, but he didn't even need to read the text. "Mycroft" he muttered.
The car pulled up at an abandoned factory in a London suburb. John left his shopping in the car and followed 'Anthea' inside. In the centre of the large, empty room were two armchairs facing each other. With his back to John sat Mycroft, twirling his umbrella beside him. "Do take a seat John." He invited, "I need to have a talk with you."
"What about?" Asked John, taking a seat. He saw 'Anthea' leave the room, still on her phone as she did so.
"I'm assuming Hamish is to become a permanent resident of two-hundred and twenty one B Baker Street."
"Well, yes. He's going to school next year." Mycroft leant forward in his chair,
"Don't you think it's a little odd?" He asked, "That the cold, emotionless Sherlock Holmes has taken such a liking to the child?"
"Uh," John paused, "W- What are you trying to imply?"
"Only that his paternal instincts are very out of character."
John sighed as he stood up, "I think you're just bitter that your brother has found something that makes him happy."
"Ah," Mycroft laughed as he leant on his umbrella to get to his feet, he attempted to change the subject, "Did they ever solve that case? The French smugglers?"
"Uh, yes," John paused to think, "Found their headquarters from the mud under his fingernails or something. They spent days down at St. Bart's."
Mycroft smiled,"Goodbye doctor Watson."