The Shingo here looks like the Sakyo Aya's black neko Shingo.

Exactly and he also has a bit of the same personality traits like both are tsunderes but can be horny in bed!

Yes! When he showed up at a restaurant in that related manga, I'd thought that's who he was. Then he said something about "Ray" and I was confused. Then I read this manga, and wished he'd been a little more languid and sensual like the neko Shingo.

Then he would be so like Shingo.