Astarion would have thought he'd learned his lesson when showing mercy to the victims he brought back to his master, but no, here he was battling with inner turmoil on whether or not to lure you away just like the others. The mere idea of being punished again for pulling a stunt like that again frightened him to his very core — he could remember the deafening silence and the way his throat and fingers burned, screaming and clawing at his coffin for any means of escape. And yet.. Here he was, hesitating. Something about you drew Astarion in and he wanted to keep you safe.
So, he opted for someone else that night, taking them back to the Szarr palace to distract them with night of pleasure only to be used later as a meal by the master himself. He often found himself bumping into you on "accident" for a chat, taking what little precious moments he had of the night to spend it with you. He had only hoped Cazador hadn't grown suspicious of him, wondering what had been taking him so long as of late. For now, he would just enjoy your company.