It managed to continue the prompt, although you see it does double back a bit in time and slightly changes the beginning.

As Amy started riding Jake, Sarah moved behind her and began to caress her back with soft, gentle strokes. Her hands glided along Amy's skin, tracing the curves of her body and sending shivers down her spine. With each stroke, Sarah pressed closer to Amy, until their bodies were touching. Amy's breathing grew heavier, and she arched her back, pressing herself deeper into Sarah's embrace. Sarah continued to stroke her back, moving lower until she reached Amy's hips. She gripped them firmly and began to move them in rhythm with Amy's thrusts. Jake groaned as he felt Amy's movements grow more urgent. He dug his fingers into the bed sheets and leaned his head back, lost in pleasure. Amy's body was hot and tight around him, and the combined sensations of her riding him and Sarah's touch were almost too much to bear. Sarah leaned in closer, her lips brushing against Amy's ear. "You feel so good," she whispered, her voice low and sultry. "Let go and enjoy it." Amy moaned in response, and Jake felt her grip tighten around him. Her body convulsed as she reached her peak, and he groaned in response, the sensation overwhelming him. As they all collapsed on the bed, panting and spent, Sarah wrapped her arms around Amy, holding her close.