you never told Dilluc that you know about him as you knew you would be kidnapped and taken to be forced to be his so nowadays you stayed away from people so they didn't get killed by your best friend Dilluc, he had a obsession with you a... Unhealthy one you never spoke up about it until you accidentally blurted it out Infront of him

...You Know What?...

*His grin was errie since it looked almost stalker like"

Repeat what you said (User).