After considering the proposal for several moments, K ventures a cautious, "Maybe...? Would you like that?"

The uncertainty doesn't stem from disinterest so much as his mind being elsewhere, still perpetually circling back to those chilling words: what if I am not that man anymore? What if I am not Viktor? K's worried about him, not about acting out fantasies that he suspects have more to do with unmet emotional needs than physical desire, anyway.

"But you also don't need to worry about those silly fantasies. Just having you here is enough."