Ashton might live up to a different moral code than most, but he was still biologically like any other male on the planet. He was program to respond to visual stimuli and Malia was offering one too many stimuli. But he could defeat his urges, he knew he could. He just had to maintain focus and keep in mind that they were here for a surf lesson and nothing more.
As a way to distract his thoughts, he tried to explain to her the next step in the process, that she was going to paddle out past the waves while on her belly. At her question, he smiled. "You don't hold onto the board, you just balance on your belly." He also had assured her that he wouldn't leave her side. He would help her to paddle out They wouldn't be going as far as he normally would, so he was confident that he could help.
Once they were out deep enough that the water was up to his chest, he told her to sit up on the board. She questioned him and he nodded. "Yes, right now." He held the board steady, hoping that it would help offer her some sort of balance as she tried to figure out how to sit up on the board. He wanted her to work through the problem. He could tell her all day every day how to do it, but until she did it herself, she would never truly learn.
And when she was finally up on the board herself, he offered her a smile. "Good job, Malia." He had to look up because her breasts were right in his line of sight and it certainly wasn't helping the already budding problem nestled in his trunks. At her question, he cleared his throat as he made sure his eyes were on hers. "I used to do this every morning back home. It was my way to relieve stress." He could remember coming out to the beach well before dawn and it was just him and the waves. It was always so freeing. He loved sharing his sport with others. Surfing was not something everyone was able to do.