That trite little quip alone would have made him groan, even without a cock being shoved into his mouth. And now he couldn't really do anything to display his discontent, being flanked from both ends and forced into a hypothetical corner. Izaya could very well continue making a fit but he risked the fact that Delic might think it felt good. At the same time, he didn't clamp his teeth down. Psyche's pounding didn't help either, and from his lack of finesse it was hard to find any part of this enjoyable. He claws at the mattress beneath him, trying to stabilize.