It wasn't a secret, it just wasn't any one else's business.
The gasps, the teeth, the kisses, the lingering touches, and the sweet words were only for the people involved.
No one needed to know that when Sirius angled himself just right, Oliver wouldn't moan; he'd whimper, and that it would always drive Sirius mad.
No one needed to know that Oliver had joined the Order of the Phoenix so he could be closer to Sirius.
No one needed to know that Sirius grinned every time he heard Oliver's name on the Wireless Wizarding Network.
No one needed to know that Oliver started wearing cherry flavoured chapstick because Sirius mentioned he loved cherries; despite the fact he hated the flavour himself.
No one needed to know that the only thing they had fought over was who was going to cook breakfast the next morning.
No one needed to know that Sirius only minded Quidditch rambling when Oliver was the one doing it.
No one needed to know that Oliver hated being in his London Flat because Sirius was not.
No one needed to know that Sirius' dreams were often about Oliver, and only half of them were sexual.
No one needed to know that Oliver did not go to the Department Of Mysteries, not because he had Practice the next day, because Sirius asked him to stay behind.
No one needed to know that the last thought through Sirius' mind as his cousin sent that curse at him wasn't about Harry or Remus; but of Oliver, and how much he truly cared for the younger, and how mad at himself he was that he had not told Oliver exactly how much.
No one needed to know that Oliver cried himself to sleep for two months, knowing that Sirius had loved him, and that he had loved Sirius.
No one needed to know, because it was nobody else's business but their own.
