I love this sequence. It makes me imagine what lead to all of this. The attacker must have stripped off her clothes and enters the bedroom with the explicit goal to maul the sleeping woman's tits. She isn't trying to keep her tits protected by clothes and she doesn't defend herself, she wants this to be a nasty mauling FIGHT.
The woman in bed wakes up as she hears someone enter. It's too late to get up, her attacker is already on her. As her big tits are under attack, she IMMEDIATELY goes for her attacker's huge tits. There is a lot of experience and vicious intent there, on both sides. You can tell they will try to tear each other's tits off.