He did not actually sense Cian there. He had closed himself off so tightly that the others in the house were finally vacant from his head and he could just focus on... the box, bursting at the seams. The stars were singing to him but he couldn't understand the words which was funny because he was an omniglot so he should have known.
But then he noticed long legs stretching out next to him. Connie wasn't sure he could look and he definitely couldn't speak. His 'selective mutism' was back with a vengeance and even just thinking about forming words made his jaw clench even tighter. So instead, he quietly just leaned over, resting against Cian as he watched the stars dance.