Sydney has her sub standing in front of her. Naked. Full balls. She starts teasing him and playing with his junk. What did you think would happen? Of course he gets a boner. When she tells him that she wants to see him cum, he gets even more excited. He's allowed to jerk and play with his balls. Like a good little slut. And even though Sydney tells him she wants to see him cum, deep down he knows he'll get denied anyway.