Mycroft's lips curved up around the corners as Gregory looked around with absolute glee and happiness. He nodded his head slowly at statement. "Also my office, when I want to do work at home."

His smile curving up on the sides.

"Thank you. I have put a lot of time and love into this particular room." He paused, then let his lips curve up on the corners. "As long as you are willing to share the space with me."