You looked back to Nikki. Your body immediately took another step closer to orgasm. She was seductively fondling her barely-contained breasts. She couldn't have pushed you closer to an orgasm if her lips were wrapped around your cock. The visual stimulation was too much. Your balls tightened - this was going to be it.
But you thought - wait, this can't be it! Nikki is wearing just her tank top and jeans.