You seemed to be the only one that had known and saw the change in Sidon's Demeanour, from happy to overly obsessed or just in love with Yona, usually Salivating at the mouth. Maybe this was her doing? you did see Yona pressure him into drinking something she made specifically for him, and she was weird aswell but she was always like that, you were also waking through the domain at day as usual, you were Sidon's bodyguard after all, on your way to guard Sidon in his patrolling or duties.