What is Yue's relationship with Toya? In Cardcaptor Sakura, Yukito and Toya are romantically involved, or at least shown to have romantic feelings for each other. Yukito tells Sakura of his love for Toya. Has it ever been expressed or officially announced what Yue, Yukito's alter-ego, feels towards Toya?
As you have said, Toya and Yukito has romantic feelings for each other. As for Yue, it can be implied that he has no romantic feelings for Toya (since he knew ever since everything about Yukito, he probably had known that Yukito has feelings for Toya and wouldn't interfere). And according here, 


  Yue was in quite a strong and close intimate relationship with Clow
  Reed. 


Yue was even against Sakura, as he strongly believed that no one succeed Clow Reed, but later on accepted her as his new master. So if there's somebody who Yue has romantic feelings for, it probably would be Clow Reed.

In addition, as far as I can remember, the only specific event that Yue and Toya had a conversation was when Toya gave his power to Yue and made Yue promise to protect Sakura and Yukito.