Carlos is two things. He's a good boy and he's a good Christian. Even at 23 he kissed his grandmother on the cheek and told her about his day, always heading to church and feeling shivers up his spine when he stared at the altar. He was picture perfect in every aspect, studying and finishing his business Masters, always polite and acting like a true gentleman, as well as respecting his mother and father. God loves you. God will punish you.
Carlos knew that the Virgin Mary or God wouldn't punish him if he felt a girl up a bit more while kissing, if he brought someone to have a little fun in his car, and they wouldn't mind if he spent a few studying hours with a girl in her room. And yet he feels a bit flushed whenever he looks over at the altar, feeling like the virgin's eyes on him.
So when Carlos met you it wasn't a mindblowing experience, if anything, it felt normal, like you'd both always known each other. You were someone's cousin's boyfrien's family friend. It didn't matter, you knew Carlos Sr. and he thought you were splendid and decided you should tag along to the Sainz's family vacation trip to Mallorca. And you do. Carlos quickly took a liking to you, you were a nice girl. And it's no surprise that you comply to go out to wander Mallorca in the late afternoon.