He can't just ignore the request

"So you want me to help, then?" Jack asked her, as he reached for the bottle of lotion, while trying to hide the fact that some parts of him were in fact much more eager to help than he was willing to admit to himself. He couldn't simply turn down his daughter's request however, or that's what he wanted to think at least, while glancing down at the back of her smooth and exposed young figure.

"Oh, yes!" The girl smiled right back at him, while acting completely oblivious to the fact that she was nearly entirely naked before him. In fact she wasn't just ignoring it, but instead she was clearly enjoying herself, and Jack could almost swear that he heard her purring softly when he moved closer, to pour some of the lotion onto her skin. Then he felt himself hesitating for just a moment, before leaning down over the sun chair, and started spreading some of the coolant liquid onto her slender back.

"Mm, yeah...!" She hummed as he kept working her over with his thumbs, and he could hear her sighing in delight while he started kneading her flesh in earnest. It wasn't so far from asking out loud for a full massage, which her father wasn't too late to pick up on, even as he knew that it really wasn't such a great idea after all. Soon enough he could feel his hardon straining against the confines of his pants, and he found that he could no longer remain standing beside her, in fear that she might notice the obvious bulge in front of his crotch.

For that reason he decided to move in further behind her, until he was practically straddling the sun chair in order to reach the girl's back, although it also left him in another quite awkward position, with her shapely body sprawled out directly underneath him. He wasn't even sure if it helped cover up his condition in the end, at least not if seen from the side, but Kate herself wouldn't notice it as easily as long as she stayed on her front.

The idea of her turning around made his erection throb even harder though, but that too was a minor concern compared to what would happen if she actually did. Still it was definitively a problem that grew on him, and Jack had trouble to keep his mind from wandering while he continued massaging his daughter's back, to the point where he suddenly realized that his hands had been moving further downwards on their own, all the way to the skimpy waistband which marked the beginning of her well rounded bottom.

"Sorry about that..." He started mumbling, even as he hadn't been doing anything wrong so far, except for having those dirty thoughts that continuously popped up inside of his head at this point. It seemed like Catherine had nothing to complain about either, and instead of telling him to stop she simply waved her legs a bit, as if she was asking for more.

"Fine then..." Jack figured to himself, but felt just a pang of guilt as he pictured those firm, young buttocks under the palm of his hands. To save himself from that kind of temptation he quickly moved down to the lower part of the sun chair, to slowly start working his way up from the girl's feet instead. It still didn't help him too much however, as it wasn't long before he reached the top of her thighs, and he was nearly holding his breath while he glanced up between them.

The girl still didn't seem to notice or care about his situation, but continued urging him on with happy little noises, while he worked his way back down her long, beautiful legs. All too soon he'd reached her bottom once again, and found himself wondering if he should ask if she wanted him to continue, or simply decide he was already finished.

"What...?" She asked him innocently, in the same teasing voice he'd heard her using so many times before, while she gave him another little friendly wink over the top of her sunglasses. "Do you think my thong is in the way...?"

"That's not the problem at all!" Jack tried to protest, but found himself speechless at the mere implication of what she was asking, and even more so when she moved her hands to tug at the skimpy little garment in question. He'd never believed that she would actually take it off right in front of his eyes, but even the slightest insinuation was having a huge impact on his already strained libido, and left him waiting in silence while his daughter continued to tease him further...