Astarion arched his back slightly to press against him as Thrawn pulled him closer, and he opened his mouth against the kiss, tongue sliding against Thrawn's- though he was careful about his teeth so as to not accidentally nick the other man with his fangs. He let the kiss linger a while, before pulling back and moving his hands to Thrawn's chest- gently nudging him toward the bed, and once he was satisfied with the position- shoved the other man back and onto the bed- giving him little time to react.

He was quick to follow- moving on top of him and using his knee to push Thrawn's legs apart while his hands rested at each side of his head, almost caging him in- leaning down to steal another kiss before his lips found their way to trail down his jawline and neck, pausing briefly where he could feel his pulse just beneath his skin.

Had things been different he might have gone for the bite. As it was, he kept his teeth away- instead moving so that he was bracing himself on one hand while the other went to the top of Thrawn's uniform to try and tug it open.