His gloves don't cover his thumb, so... Ignis tipping up somebody's chin and placing his ungloved thumb on the other person's lower lip? Ignis driving his lover to distraction when he brings his own hands up to his chin when he's thinking but taps his thumb against his mouth?? Somebody sucking on his gloves, feeling the press of Ignis' bare skin as a single point of contact on their face??? Any of these things, please.