Personally, I think the cover is about the viscount we don't know and the master (long haired guy), they re probably the main characters...but for now the story is focus on lord itsuki ( the Long haired's so called adopt child) and yoshino ( I think he is the butler of the master)
Basically itsuki ,whe he was child, has been found by the Long haired' guy and his butler yoshino on the street.. so he got official ly adopted by the Long haired as his son but in thruth ,the Long haired just did it to have sex with him since he has been with him. Itsuki doesn't love the master but bear it since he will be the only heir but he also love yoshino who love him in the same way but doesn't say anything because he is. A servant. And I think the master got jealous when itsuki said Yoshino is more beautiful than him...the master also stopped What he did when yoshino said the viscount name so I think the master is in love with the viscount
Ohhhh thanks a lot..... i finally understand I think
Anyone care to explain me.... plz