Eichel does want his mouth (of course he does), but he wants more for Jade to choose it on his own. He hadn't seemed to mind sucking Heine's cock earlier, anyway.

So he simply says, "Whichever is easier," and lets go of his hair. For a second his gaze moves away and lands on the mess starting to drip out of Jade's open entrance; he smiles when he looks back at his student again.