Caius kept the Mana Lamp up with one hand while he wrapped his other arm around Aylin's waist, not pulling her closer—because she had drawn herself as close to him as possible already—but holding her in place.
He had actually gotten quite good at keeping his fangs from causing injury while kissing in his shifted form but Aylin's intense enthusiasm was rendering all that moot. So he just tried to keep his fangs from piercing her as well as he could and hoped for the best.
Feeling those large breasts—of a size that would compete with Lea's—pressing against his chest, Caius couldn't really be bothered with self-control. He had been expecting some period of Aylin just taking the reveal in. He had expected to have to calm her. Getting jumped like this hadn't quite occurred to him.
And this could be seen as an oversight on his part. After all, who was this if not Aylin Khione? Her level of obsession would hardly be dampened by something like vampirism.
