That question mark is there because she has plenty of sex scenes, playing two different characters, but not there’s not one single frame where her face and breasts are both visible. So make of it what you will. All I can confirm is that somebody is topless, as you can see below.
I watched this the other day and knew right away it was a body double. In every other sex scene she was clothed and you could see her face, but in this one exception she was unclothed and you couldn’t see her face. Not that I’m complaining about getting nudity, but it kinda makes you wonder why they even bothered hiring a body double who was only on screen for like five seconds instead of just giving us another clothed sex scene.