[Ryunosuke looks openly startled to have such an accusation leveled at him; it's not as if he's never been called a liar before, but when it has happened, it would usually be in relation to something specific. Not this broad, sweeping slander against his person.

In addition to the tail, he has other dragon-like features-- ears, claws, horns-- but arguably the weirdest are the two feathery white wings at his back, which are completely incongruous to the rest of his changes. Ryunosuke shuffles them unhappily, the feathers puffing up a bit in his irritation, as he levels a scowl at Kaeya.]

That's... Rich, coming from the man who introduced himself to me using a fake name, Sebastian.

[He turns his attention back to the actual Sebastian present, his deadpan expression shifting to a sincere frown of concern.]

He's not wrong though; it's not poison, at least not in the traditional sense of the word. It's Kenoma, a... A sort of liquefied form of a force of darkness and despair. It won't kill you, but it will cause you immense pain and torment, all in the name of breaking your spirit and turning you into a willing slave to a tyrant.

[Very pointedly looking back at you now, Kaeya :/]