OVA Furachi episode 2

Standing before Ikenaga, with her full, commanding presence, Kai braced himself. Surely, she would call him a pervert, a stalker, a freak. And in a way, she did, but not in the way he expected. Instead of disappointment, she offered him a knowing smile and calmly labeled him for what he was: a fellow pervert. She confessed that she had always felt his gaze upon her—that those late-night glances had never gone unnoticed.
The irony was staggering. Kai had believed himself to be the hidden observer, the one in control. In truth, he had been the one on display all along.
But Ikenaga wasn’t finished. She moved closer, a dreamy, captivated expression on her face. Before he could process what was happening, her full, inviting body pressed against him.