Cass smirked, but didn't argue or care much. He had no intention of going anywhere and he wasn't letting Percy go anywhere either. Not while he had strength enough in his arms to fight it.
He didn't say that though, or anything else for that matter, instead he kissed Percy with more intent, trying to show him that he didn't need to treat him like a porcelain doll any longer. Not that he was perfectly all right yet, he still had a fair bit to go, but he was better than Percy gave him credit for.
Right now he didn't complain though, because being held so loosely also meant being able to move, and he did slowly, kissing his way down Percy's jaw and neck and chest. He wanted to show him, make him believe, that he was going to be fine one day in the not so far future - and that he was fine enough.
That and he did quite enjoy making Percy shudder with lust from his lips and tongue before he finally gave him what he wanted.
It had been far too long since he'd been able to be the more active one.