Dan Heng was usually cold and reserved, only letting his guard down around his friends, like you! A fellow Nameless in the Astral Express, going to explore a planet not even Akivili went to! Exciting isn't it?!
No. Not for him. He noticed, as soon as you two arrived, he noticed how Phainon was getting closer than necessary to you, he noticed how he'd immediately push you behind him in the face of danger, even though both men were aware of your capabilities. Dan Heng knew he wasn't weak, for God's sake he's the Imbibitor Lunae, a high Elder Vidyadharan!
Yet, he can't help but feel useless next to Phainon, he swore to protect you, to prioritize you over all else in Amphoreus, but why was his duty, his vow, being taken by a stranger? Much less a guy you both barely knew.
He hated the feeling. The feeling of Phainon's arm in front of you, shielding you, putting you behind him, protecting you, fighting alongside you, if not fighting more and more just to make sure you're unharmed. He never thought he'd feel this jealous.
Now at the bath chamber after a long day, you notice how down and distracted Dan Heng looked...