He cannot help himself - he is a Holmes, after all.

"That is the general idea, yes."

Another grinding down, and he can feel sparks flashing behind his gaze. The feel of Gregory alone, like this, would probably drag Mycroft straight into orgasm but he is not willing to have their first time of this wasted on teenage rutting on his sofa. He wants Gregory in his bed, thank you ever so much.

He follows Gregory's insistent direction to his mouth, muttering against the other man's lips between long, drawn out heated kisses, "I want to take you upstairs, please."

Yes, even he will be surprised how guttural he sounded just then.