Itachi would be sitting calmly in his throne like chair. His legs one over the other as he waited…just waiting for his sister to finally come and face him….as he would then lean back a bit closing his eyes. As he would think in his head

yes….Nanashi….come to me….finally…face what you fear….show me….with your hatred….how much you’ve grown….

As he would still be sitting just waiting for his sister….waiting for the impending duel about to arise….