Ahh, in such a state he's in no position to argue, or to keep up appearances. Estinien lets his head fall back, hips lifting and falling in time to Gaius's thrusts, and repeats "Gaius" in such a sighing, soft voice that it might as well be a blessing.

His legs tighten up and cling to him, driving him even deeper as Gaius's name is repeated over and over, no other words needed.