1. Skull Necklace, Heavy Chain Collar, Contacts, Devil Horns, Fangs
2. Definitely Sadism. Though I would have preferred to point out the loophole he made, and still had the option to send Aster out and have essentially the same scene, to build trust with Argos.
3. I would really enjoy an option to tell Asterion that I am Sadistic, but still kind and prefer to have a tight leash on him AND Argos. Keeping his pain within reason, preferably consensual. Maybe even in a romantic measure. Though I'll admit as a player I do care slightly more about making Argos happy than Asterion. But that's not to say I don't like him in the slightest!