I was going to post (sfw) example pictures, but apparently since I have less than 15 posts I can't.
Anyways, they were shadow Yukiko, shadow Aigis, and shadow Yukari from Persona 4 Arena Ultimax. Just search "shadow [Name] Ultimax" in google and you'll probably recognize what expression I mean.
I've seen some hentai with girls having this expression, but never figured out if there's an actual genre for it or anything.
Anyways, they were shadow Yukiko, shadow Aigis, and shadow Yukari from Persona 4 Arena Ultimax. Just search "shadow [Name] Ultimax" in google and you'll probably recognize what expression I mean.
I've seen some hentai with girls having this expression, but never figured out if there's an actual genre for it or anything.