In this scene, Sam mimes the fiery lover. Just as a teenager imagines that a lover has to be. With little or no respect for marriage or for the Parker family, who are friends. That includes Liam as well. All this is Sam, because of his youth and the behavior of Sophia not to blame. If this had happened to me at his age, I would have been more shy, but I would have acted similarly.
But when the player makes the choice that Sam hides under water, the scene becomes even hotter, but at the same time Sam shows no respect for Sophia here. He literally risks everything just for his stupid ego and his horniness. If Liam had caught them, nothing would have happened to Sam, but he would have destroyed Sophia's life immediately. I hope Sam learns and behaves differently in the future.
And the picture with Dylan, I didn't even remember him having his finger under the strap and touching the skin - and Sophia not pushing him away, that shows a familiarity Sam still has to work on. It's just a small gesture but I like it better than the whole Jacuzzi event.
I also have this opinion because they swear so starry-eyed at their hero.