Yuusuke shutting down another door in front of Sun goals there, almost can see her heart breaking there. No preggo tummy in the future for her it seems...
Again he abandons his free will, being dragged into contry inner politics.
Ayuuka progress in being suspicious is a running trope in this story, clearly she was close to Serakani and whatever was his end might effect her, especially if they shared a love with each other.