He hums, bucking eagerly into the kisses on his chest and belly. As Wing continues even further his optic’s brighten and his mouth falls open to pant raggedly. Ambulon’s finger’s wedge into a gap in the mech’s plating, holding on for dear life. His entire body quivers with need and his valve squeezes out a thick bead of lubricant in anticipation.

“Please!” it’s a breathless gasp but he gives his consent clear as day.

He can't recall any of his, admittedly few, interfaces being like this. For someone who he's just met, Wing is so gentle and considerate and Primus is Ambulon turned on. He can barely take the tiny pause at all and his hips wiggle eagerly.