1. Hide his scissors.
2.Say the color red makes him look fat.
3.Say he is a sorry excuse for a reaper.
4.Show him grellxciel yaoi.
5.Hide his glasses.
6.Throw mud in his hair.
7.Tell him he will be forever single.
8.Tell him Sebastian is your lover.
9.Set a rabid bunch of Sebastian fangirls on him so he gets mauled to death
10.Annoy Grell like Grell annoys Sebastian