Small variables added to a currently simple equation, settling into a whole new process. if teeth then shiver, if tongue then part lips. If nudge then follow, head tilting back, fingers curling tight in Locus' shirt. Another, lower twist of sound shivers out of him as he tastes that warmth, Locus' breath. Tentative he slips the tip of his tongue out to trace the seam of Locus' lips in turn. Mimicking his motions until he has enough to try acting on his own.