Ianto doesn't know why they're stopping at first, but he slows anyway. John reaching for his hands and he looks down at their hands as well, because something about them seems to be fascinating, though it escapes him exactly what. He squeezes slightly in return, because it seems like the right thing to do, before he glances back up at him.

Oh, he thinks to himself, as he stares into John's eyes and his stomach does a funny little flip in turn. John's hands are very warm in his, and the look in his eyes is very intense, and Ianto thinks that he might just actually believe him, in truth. John has never let him down before, after all.

Is he making a stupid face? He's probably making a stupid face. He makes sure that he closes his mouth as he tries to piece together some form of response to make in return. In the end the words are out before he's thought them through, his fingers tightening hard on John's as his eyes widen a fraction, as though he's surprising even himself.

"Then don't leave me."

Because Ianto may be very contentedly stoned within an inch of his life, but even still. On a deep, subconscious level, John has him worried.