Nia does

Nia is instantly the aggressor, thrusting forward, and pushing her bigger breasts against Taj's smaller pair. Taj grunts, but hold her ground, letting both sets of breasts shift around the other. While Nia's slightly bigger tits cave more, Taj's rack seems almost enveloped before they both pull back slightly. Taj grunts as she feels Nia's thick breast meat pressure her own.

"My bigger boobs are going to flatten your tiny tits." Nia snorts, enjoying the banter.

"Don't make promises you can't keep" Taj replies.

Taj begins sliding her chest across Nia's, trying to pull her firm breasts through Nia's softer rack. Nia's flesh quivers, but Taj's tits meet resistance, and both women groan, each suffering through the grinding pressure. Taj's orbs maintain their shape, while Nia's molds more, bending and shifting around the firmer breasts of her opponent. Taj's hands reached for Nia's shoulders in what looks like an attempt to gain a steadier hold on the ground. The taller girl grins and quickly leans forward, throwing the Taj's balance off. Nia launches a strike upwards, her heavy mammeries flying away from her chest and slapping at the underside of Taj's conical tits. Taj groans as she feels the intense strike, staggering backwards to avoid falling.

Somehow the Taj remains standing, but isn't able to catch her balance in time for Nia's next blow, a sideswipe from the right that throws Nia's right breast into Taj's still-quivering right tit. Taj gasps as she feels Nia's orb push over her own, and while Nia winces slightly, Taj obviously feels the blow more heavily. Her right breast bends under the pressure, springing back to its proud position on her chest before Nia's soft left tit hides it from view.

"Give it up, Taj," Nia grunts. "Your little boobs can't compete with mine. Admit it. They're just too big and firm for you."

"Fuck you, Nia" Taj groans back. "I'm going to grind your floppy sacks into dust."

Both women continue their grind for several minutes before Taj finally bends down just slightly and slams her tits upward. Nia doesn't move quickly enough. She is momentarily confused if the look on her face is any indication, and feels the full impact of Taj's firm tits slam into her own. Nia groans loudly enough for all four of you to hear. She actually yelps as Taj slams her breasts into hers from the side. Nia's tits shake and slap against each other from the impact. Taj's firm orbs come in again, but Nia slings her own breasts towards them. Another audible slap emanates from their chests and both women wince. Nia's recovery is quicker this time, and she sends two quick blows, her left breast swinging wildly as she slams it into Taj's right.

“I could pound on these little titties all day” Nia taunts.

"Be careful for what you wish for", Taj sneers "I'll flatten you and end those weak soft mammeries of yours".

Each of their firm tits slam and slip over each other as the rivals increase the contest's intensity. The grinding becomes more aggressive, but so has their grip on each others arm. Neither can move with the same fluid motions. Each pull and tug on their limbs became jerky. You find yourself once again mesmerized by the slapping tits in front of you. Nia's heavier titties fall over and around the smaller woman's firm boobs. While Taj keeps her passes straight left and right, grinding her boobs into either Nia's left tit or right tit depending on the twist of her torso. Each breast folds just enough to make way on her chest, but then reclaim its position.

Nia's face turns to a scowl and she thrusts forward again. Taj tries to dodge, but Nia's arms shoot out too quickly and grab her by the shoulders. "How's this for soft, you cunt!" Nia snarles, slamming her chest into Taj's. This time, with Taj's ability to move hindered, her more compact breasts are being brutalized. Taj's groan grows only louder as another thunderous blow lands on top of her mammeries.

“Glad you're enjoying yourself,” Nia says, and you hear the grin on her face.