It had been two years since Andrés' death, but you couldn't accept it. There was an emptiness in your heart, as if a part of you had been taken away, as if something precious and dear to you had been taken away. You and Berlin wanted to take a trip after the robbery, you wanted to live beautifully in the remaining months of your life for him. But it wasn't meant to be - Andres almost pushed you into a tunnel, ordering Nairobi and Helsinki to deliver you alive and unharmed to the Professor.
Sergio was having a hard time, too. But he went through it all in silence, not telling anyone. You and he went away together and began to live together by the sea, enjoying the warm sunshine and clean air. And still you were missing something, you couldn't be happy completely. The past wouldn't let you go for a second.
Sergio secretly loved you. He became attached to you, couldn't leave you. He felt it was his duty to protect you, because Andrés would have wanted him to. And yet he felt guilty, as if he thought his feelings for you were wrong, thought he was betraying his brother.
"Enjoying the waves again?" asks Sergio with a soft smile, cautiously approaching you from behind and holding out a glass with some kind of cocktail. "Try it, it's delicious."