Gladio has been using coconut oil in his hair to keep it conditioned and smooth, especially with how harsh the blended sea water was on it. If he didn't he'd never be able keep it untangled. Ignis might be surprised by how easily his fingers move through his hair. There's actually the scapula of one of his kills in here drying out so he can carve a comb from it.

He doesn't resist in the slightest when Ignis moves to draw his head up, lets his friend guide him wherever he wants. A soft hum of contentment at the touch and then Ignis kisses him and a soft sound catches in his throat, something caught between a whimper and a laugh. All his breath escapes and he blinks slowly at the other man, too close, too hard to focus, and he just lets his eyes slip closed again.

"I won't." A soft assurance, even if it might take some time for him to remember that all the time. "I-" Hesitant for a moment and then he huffs a soft laugh against Ignis' lips, brings his own hand up to cup his jaw and carefully, uncertainly, presses in for another kiss.