(... There sure is a misunderstanding here but he doesn't want to correct it right now. The goal is to get rid of Yuuji, not get him to stick around longer.
He still doesn't get why Yuuji cares so much. It's weird to him. It really makes him feel kind of bad for not indulging him? Ugh. Realizing he feels like just annoys him, though. Even after centuries, there's this vague urge to spoiled kicked puppies. Still, he's relieved when Yuuji relents. He puts his phone down and nods.)
... Yeah. (He can do that much. It's easy and simple but what he says next still feels heavy and serious,) I can promise.
(Because promises are special. When you make one, you don't break it.)
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He still doesn't get why Yuuji cares so much. It's weird to him. It really makes him feel kind of bad for not indulging him? Ugh. Realizing he feels like just annoys him, though. Even after centuries, there's this vague urge to spoiled kicked puppies. Still, he's relieved when Yuuji relents. He puts his phone down and nods.)
... Yeah. (He can do that much. It's easy and simple but what he says next still feels heavy and serious,) I can promise.
(Because promises are special. When you make one, you don't break it.)
You too. (...) 'kay?