Hm, maybe Trixie and Blueblood, anthro, with Trixie having unrealistically large breasts?

“You like it when I do that, huh, Prince Charming?”

Blueblood could only moan as Trixie pressed her chest harder against his crotch. She sneered, squeezing her oversized breasts against his cock. Sure, he was a nice size - though she’d never say it out loud - but there wasn’t a single universe where his genitalia could ever compare to her incredible bust.

She gave a little moan over her own as she massaged the sides of her breasts, perfectly pitched to get him even more aroused. Admittedly, some part of it was in genuine lust - Blueblood might not be the worst lay in the world, but it was the massive, globular spheres of flesh she was squeezing that really set her world on fire.

Trixie had never known another pony to have as large breasts as she. Once, Twilight Sparkle had come close (though the little slut’s friends had had the nerve to tell Trixie that her bust was smaller), but a few potions from a local had fixed that right up. And now, she reflected smugly, squeezing a fist-sized nipple and feeling a steady stream of warm milk dripping down her arm, there was nopony in Equestria who could contest her.

“You little slut,” Blueblood panted out as she gave him a second to breathe. “It seems…nggh…that my time with you won’t be wasted after all.”

“Little slut?” Trixie asked, her sneer growing even larger. “Fuckboy, I’m the biggest slut you’re ever going to meet.” And in more ways than one, she added silently, hefting her watermelon-sized assets over his torso.

Blueblood shuddered in involuntarily pleasure, his cock spurting a bit of pre onto Trixie’s bust. She grinned and leaned over, slowly licking up a drop of cum, savoring the salty flavor.

“You like that, hm?” Blueblood grunted out, his impending orgasm clearly taking almost all of his attention. “Do you enjoy the taste of a prince?”

“Edible,” Trixie said, grinning. “But you’re going to enjoy my taste even more.” She pushed a nipple toward him. It was already leaking warm milk, the fluids dripping down and mixing with Blueblood’s splattered pre.

Blueblood eyed the oversized nipple warily. “Are you sure this is common practice among…commoners?”

“You accuse Trixie of lies?” Trixie said. She squeezed her tits together, moving them down until they’d reached the base of Blueblood’s cock - and then slowly moved them up, her milk and Blueblood’s pre provide ample lubrication for a titfuck. He seemed almost completely overwhelmed at the sheer size of her breasts, the pair together probably weighing half as much as she did. “Fine, then - you can take Trixie’s word that you’ll enjoy nothing more.”

Blueblood eyed her skeptically, but then took her nipple in his mouth. He moaned around it as she kept thrusting his cock through her bust, milk dripping out of the side of his mouth as his eyes fluttered.

Trixie just grinned. Who could have known that the Crown Prince of Equestria was such an utter slut? One thing was for certain, though - by the time he’d finished cumming, she’d have him entirely in the palm of her hand.