Shidou figures the cord is why Denji didn't want to take his shirt off. So, he's not going to comment on it. It's there; it's a little weird but not the strangest thing. He's content to ignore it in favor of other things, like his nipples. Fuck, they're nice ones. So Shidou's eagerly sucking on the one in his mouth.

"Hey, it's okay. We gotta get you used to feeling good. Allowing yourself to feel good, Denji." He lifted and pressed a soft kiss to Denji's lips. "Gonna make you realize you deserve to feel this good."

Because everyone deserves to feel good. "Just relax," he murmured, kissing his cheek, moving back to his nipple, nipping at the little nub. "Relax and feel." He crooked his finger, searching, and there it was, the prostate. That little bundle of nerves that was so fun to play with. He rubbed it, looking at Denji's face to see his reaction.