[Look how romantic this position is. With their hands still joined, Ian's arm around Souji's waist, and Souji's arm around his neck, Ian could very easily make any number of suggestions based upon the connotations of this pose.
Instead, Ian releases Souji's hand to undo the clasps holding his helmet in place, lifting the front piece. He's aware that a lot of what he means is more evident through his expression than his words, and if they're going to be getting into this territory again, then it's going to be important that's as little room for misinterpretation as possible.]