She shook a finger at him, but whether the sternness was playful or in full seriousness was anybody's guess. "Don't swear on that. Swear to me." She had no way to enforce any oath-breaking, true, but at the very least maybe she would flash through his mind and dredge up some guilt should he decide to go against the promise.

She glanced over worriedly at the coughing.

"Iori-kun, you don't have to force yourself to drink, you know? Whatever is left in the bottle when you decide to stop, I'll finish off." It didn't occur to her that a petite young woman downing a large bottle of alcohol might be more worrisome than a man who had yet to acquire a taste for grain alcohol.