You offer

You pull out of Ellen, leaving a trail of cum dripping out of her pussy. "Amy," you say, watching Amy rub herself, "I think I can help you there."

"Ugnn... I'd love to, Scott... but your dick's all covered in cum..." she gasps, trying so hard to reach an orgasm that's just out of reach... "You'd put your swimmers in me without even cumming." She tenses up, seeming like she's about to climax, but... no. "FUCK!" she cries out in frustration, and she falls backwards onto the bed.

You climb up past Ellen's recovering form, and slide up Amy's body. She's breathing heavily, so close but so far from orgasm. You trail kisses up her leg, onto her inner thigh, just barely skipping over her soaking wet pussy and clit. You run your tongue up her belly, to the underside of her heaving tits. You put your hands on her hips as you continue to go up her body, nuzzling her neck, and finally kissing her lips. Your hips are now even with hers, your cock resting against her thigh.

"Say yes or no, Amy," you whisper, "but make your choice now."