[Birkin shudders against the mouth at his neck, biting his lip to hold back a whimper]

J-just for tonight. [He clears his throat, obviously trying to fight back his typical urge to blush and stammer through an explanation. He leans in, lips grazing the shell of Stein's ear as he murmurs:] Tonight, all I want is you. [Birkin draws back and looks at him through half-lidded eyes for a moment, smiling softly, before unbuttoning his pants]