As Cassius opened the door, he was looking down at a piece of paper - the paper was a letter which was given to him by a messenger, which then Cassius was directed by the King to take, so as to not appear too dissimilar from any other takers of Deston's offer of adventure. He still didn't understand why he needed to hide the fact he was a bodyguard, but he also wasn't being paid to ask questions - he was being paid to protect the prince and to do so till his last dying breath if that's how it ended up. It wasn't any more difficult than just being a bodyguard, he felt.
Cassius's eyes skim over the heads of those in the tavern. Blond, he'd said, and not much older than 20- ah, there he is, and eyeballing him as well! He folds the letter neatly and puts it in his satchel before walking closer to the prince, giving him a small bow of the head that could be mistaken for just a nod before sitting besides him. Or, rather, he sits just a seat away from him, as to give him a bit of space. He turns to look at Deston.. and honestly? Cassius sees why the King felt such a need to hire a mercenary such as himself. Deston's twiggy, bright-eyed, and entirely too eager - all of which paint blatant targets on his back. He'd be eaten alive - and that could be figuratively or literally, depending.
Cassius lets the silence between them linger for maybe a bit too long before he asks, "And what are you so excited for, pray tell?" Of course he already knew the answer, but was still curious as to how Deston might respond.