One is enough

Jessica wished to keep some degree of chastity, she couldn't think of what would become of her should she bare a beast's seed in her womb. Jessica patted her hands on the beast in front of her with some urgency. Behind her, the second one was sliding its fingers up to her inner thigh. Just as it touched her folds, sending an unexpected shock of unwanted sensation through Jessica, the beast above opened it eyes.

The Silver-cocked beast snarled, and pushed back its compatriot, rolling it to the ground. The sudden motion pushed the cock deep into Jessica's throat, choking her, as its growth resumed, though she could feel the cock get narrow, as it quested deeper into her throat. This seemed pleasurable to the beast, as it wrapped a rough hand on her head. Without air, Jessica felt a different more immediate worry for air. She could feel its mucus coat her throat, making her feel the need to cough, but the convulsion only massaged the strange thing more.
After several panicked seconds, she could feel something moving within the cock. Then relief, as the silver cock was ripped from her mouth and Jessica coughed and gasped as her savior was the meat-cocked beast, which had sprung upon the silver cocked beast. Engaged in a deadly grapple in front of her, they both already sported wounds that would kill a normal man, already splashing her with burning drops of blood.

Jessica looked over her shoulder and seeing her path entirely unimpeded, she realized she had a chance, coughing and gasping as she was. But she also recalled her grenade, full of firey potential. Then again, leaving could unite them in purpose again, and she had found a form of diplomacy that would leave her her life.