After lying down and soaking up the sun for a few minutes, Jeff's girlfriend absently runs her hand down the front of the swimsuit. The smooth texture of the fabric rubs against her body, it is a nice feeling, and she does it again.
At first, she forgets that she's rubbing Jeff against her, but soon remembers. The idea turns her on a bit, and, after checking to make sure no one is looking, she rubs her nipples.
Her friends are all out in the water, or walking among the rocky outcrop at the other end of the beach. She's on her own here, so she continues to rub her nipples against Jeff.
For Jeff, the experience is wonderful. He's stretched and pulled across her nipples, gently pinched into them and rubbed along them. Each touch makes him feel wonderful, so happy to be a swimsuit.
He feels one of her hands reach down and begin rubbing between her legs. Almost immediately, the feeling of her pussy being rubbed into him makes Jeff ecstatic. If he had a dick, it would be impossibly hard right now.
"Oh, Jeff," she moans softly.
Jeff barely notices. The constant rubbing and stretching has left him in a state of glorious bliss, unable to even think of anything beyond the pleasure he feels at that moment. It's so wonderful to be a swimsuit, he thinks vaguely, the fragments of his mind getting fainter and fainter.
Finally, she grips her crotch hard, and stiffens all over as an orgasm takes hold of her. The feeling grips Jeff too. He can feel her pleasure even as the suit, and it makes him even happier to be a swimsuit.
Meanwhile, she calms down, setting her eyes over the beach to make sure no one saw her private moment.
"It's time to go home," she says.