About half way to the top, she pretended to lose her balance, and fell down a step right into his arms. He drew her into is arms to steady her, and then tentatively placed his lips against hers...almost scared. She encouraged him by parting her lips slightly and allowing his tongue a little bit of access. He gently traced her lips with this tongue, and then pushed farther into her mouth. She responded by kissing him back with two years worth of pent up hunger and desire. They stood there, in the stairwell, halfway to the top making out like randy teenagers in a parked car. He slid his hands under the hem of her skirt and cupped her butt cheeks in his fingers, gently massaging her through the silky material. He got harder as he felt her panty covered bum, and his desire continued to grow. She broke away, and grabbed his hand away, telling him to come to the top and abruptly started moving quickly up the stairs.
She was faster than he, and when he came through the doorway into the sunshine he noticed that the wind was blowing her skirt up around her waist and she was making no move to smooth it down. Anyone from the ground could see her panties, but she didn't care. Grasping her hardened nipple through her shirt she rolled it between her fingers and asked if he wanted more. Her nipple was hard as a diamond, and a wet spot was forming at the crotch of her panties. If she had anything to say about it, he was going to take her right there on top of the light house. She grabbed him by the belt and pulled him closer to her, running her long fingers inside the front of his pants. He was so ready, but so scared at the same time. She drew him to her and began to kiss his neck while fumbling with his belt, trying to free him for her use.
He gasped, mumbling something about "we can't do this" but she wouldn't listen, she pulled him free of his jeans and briefs and ran her fingers up and down his hardened shaft. He pulled closer to her, reaching his fingers into her panties for the first time touching that secret nirvana that she was offering to him. He ran his hand gently over the already wet mound, and gently stuck one finger in her slit. She was so ready for him. With urgency she slid her panties aside and reaching around his neck pulled up and sat herself down onto his shaft. Before either of them really comprehended what they were doing they were screwing each other at the top of the lighthouse in full view of anyone looking up. She began to shudder, and gasp for breath as her orgasm began to overtake her. As it ripped through her body, the spasm were more than he could take and he came while inside of her.
She lifted her head from his shoulder, nibbled his ear and whispered "That will do to start". They rearranged their clothes; thankful no one caught them, and returned to their spouses without speaking of it again. Though that moment was always there, and they are planning how to steal the next one before she goes back home.