Andrew was just a bit too far gone, too far in the need to cum, to fully understand what his mother was offering him. He didn't fully grasp what she meant by 'inside' of her at all. All he was focused on right now was his desire to explode in her mouth. "Mo...mouth." He manages to murmur, staring right back at her, eager to see her bring him to the finish he had been desiring for so long now.