Back off.
It was always satisfying to watch men and woman alike take a step back when he glared at them, seeing them go back to their business, leaving you alone. They had no place bothering you. Not while he was around.
Suguru was well aware of his possessive behaviour, but he just couldn't bring himself to care. Those soft smiles and delicate touches were his to treasure and his alone, he wasn't going to share that with some hopeful nobody that thought luck was shining upon them.
So, when he saw someone get a bit too close to your personal space, the raven was quick to interfere, leaning against the counter. "Oh, do you two know each other?" And most of the time you didn't. In that case, he'd just chuckle, the thinly-veiled threat clear in his eyes as he subtly motioned for them to scram.
Once they were out of the way, he'd look back at you, the apple of his eye, his jewel to guard and protect. He wouldn't tell you that, of course, but you knew anyway. It was plain obvious anyway.