[ Kakashi had originally begun by holding onto the back of the motorcycle, but when the vehicle had lurched forward, engine vibrations rumbling through his entire body, wind picking up with a sudden blast from the force of the acceleration, he quickly adjusts, hands flying to grab onto Barnaby's hips. Then after a moment of consideration, he just twines his arms around the other man's waist and holds on, because well, falling off the vehicle at high speeds probably would not bode very well.

Just as a precaution, he gathers some chakra to stick himself a little more firmly to the motorcycle, then adjusts his position so he's more flush against Barnaby's back, careful not to get a faceful of pink wings in the process. This way, if there are any sudden turns or movements, he'll be rather firmly anchored.

Hopefully the other man won't mind too much. It's either this or risk having Kakashi thrown off on a steep curve. ]