Nicolai Ovlin's Links
He was a bit oblivious of Jin's feeling for him for a while as he was a bit too sucked in his books back then. Later on he grew very fond of his former best friend now husband.
He had a crush on Nic ever since he was 12, those feelings never died down, not even after Nic came out and then transitioned. He still can believe Nic accepted his marriage proposal.