Honestly you should ask Matthew what YOU want but from a sungseoker's pov i would say that you should tell him that you love his friendship/chemistry with Hanbin. Maybe like a mention that jakkkungz are a loved duo! And for other sungseok related questions you can ask: any duo schedule that you would like to do with hanbin? / hb called you his "flank", who is he to you? / what is your favourite memory or thing you have done with hb? / if you and hb were to dance to a song what would that song be? etc r some