He felt suspicious about why Atlas was so calm and trying to... seduce him. That's not a normal reaction after being betrayed.
Sebastian watched Atlas with his cautious eyes, and Atlas moved his hands away, and Atlas let his fingers slide across his chest. His fingers felt rough and hard, like someone who worked hard labor.
Sebastian closed his eyes, and he was struggling with complicated feelings. So complicated that he can't tell what he's feeling. One part of him badly wants to embrace Atlas and tell him how sorry he is for his actions. No amount of words can make up for it.
Another side of him just wants to push Atlas away because he knows he's wary now. His gut is telling him to be careful. Something about Atlas feels very strange. Atlas's eyes were dark like moonlight, dark and mysterious.
