I would use Light Elegant or Ambiance for the pink, then put 1 layer of TIO on, wipe the sticky layer off then do the black. This way if you make a mistake with the black you can easily wipe it off without getting fluff in the inhibition layer.
I would personally use a striping brush or brush a wide black line down the middle & then dip a gel brush in cleanse & clean off the extra bits at the top to give you your shape, cure & repeat.