Me, My Boss, and Our Master/Servant Relationship

1-5) Ore to Kachou no Shujuu Kankei: Taiga's a young employee who gets wasted one night while drinking with colleagues. He runs into his boss Sakaki in the restroom, who won't stop staring at his member. Sakaki even goes as far as to ask if that's normal size. Does trouble ensue after he drags Taiga