What actually happened: Lu Han blew some air to Lay's neck, and Lay squirmed away.
What the cameraman sees: Lu Han blew some air to Lay's neck, and Lay squirmed away.
What the TV viewer sees: Lu Han blew some air to Lay's neck, and Lay squirmed away.
What the fanfic writers see: The air that Lu Han blew was very soft and gentle, but it made Yi Xing squirm anyways. Memories of their previous nights flashed into his mind; memories they made between the sheets, memories compiled with Lu Han's gentle kisses to Yi Xing's sensitive neck. His mind was on the verge of going into overdrive as his senses heightened, skin becoming more sensitive than he wanted it to be. But what more could he do? They're filming for a potentially-international audience, for god's sake, and leaning towards Lu Han would be bad for their image (not that this entire challenge was ever good for their image, anyways) so he did what his mind told him to. Knees buckling and shoulders hunched, Yi Xing purposely let himself fall away from Lu Han, pulling off the bluff that he's particularly ticklish in that spot.