Istredd frankly wouldn't have noticed any kind of flirting until his hand was touched, then he went 'oh' in his head, bewildered. Lucifer is the only person he has actively tried to flirt with for years, with Yennefer it's how they've spoken to one another all their lives.

His breath catches when Lucifer pulls him in for a kiss since he rarely instigates and he leans hungrily into it. Yours. He reminds gently; not that Lucifer needs it, necessarily, he does know, but Istredd wants to make it clear all the same. With every beat of his heart, he belongs to them.

"Lucifer," he says on a sigh. Istredd cups his head in his hands, caressing his cheeks with his thumbs. "No you're not. We can throw something. Less dangerous." He kisses his forehead, pulling back to look at him.

"Are you okay?" Seeing Dean like that, being accosted in his Horizon and then his partner threatened, he must be in a place.