"Oh, fuck - " He scooped Koschei up and into his lap, and held him close, rocking and cradling him and stroking his hair. "Come on, just let it out," he murmured, against Koschei's hair, and if his face was showing just a little bit of incredulous amusement at the idea of the man who had been Jack Harkness sitting there cuddling the boy who would become the Master, none of it showed in the warm, comforting embrace of his body.