Bagi: [Laughing, sounding incredulous] A chainsaw? Yes!!!
Bad: Yeah, because chainsaws are broken.
Bagi: Yeah, I'll traumatize my brother. I think it's a nice idea. [...] Yeah, yesterday he killed me screaming, "Hey, little sis!" Now I have something to get my revenge.
Fit: I can't believe you two are siblings, though. That's crazy.
Bagi: Yeah, it's a long story, I think we should talk about that when we are back to the island.
Fit: Yeah, yeah yeah yeah, for sure.
Bagi: Yeah, a lot happened. But I think he's adopted.
Fit: Oh, you think?
Bagi: Yeah, he's too aggressive to be my brother.
Pac: [Looking down at his legs] ...Yeah, too much aggressive.
This whole part is like discovering Alex and Henry's feelings throughout the songs.
Alex has a Spanish love song to declare that he's nothing without Henry anymore and only sees him, no one else. He doesn't sing it, it's only the background music, cause it's a new feeling for him. He's still coming to terms with the fact that he's in love and hasn't shared it with the world yet.
Henry, instead, sings a song out loud. It's a drunk mess but he's telling everything he's feeling for the first time. He's declaring how good the relationship with Alex is making him feel, yet he might burn for how fast he's going. He's supposed to slow down but he wants Alex to be his supersonic man and they might crash but, in that moment of freedom, it doesn't matter that much.
Henry has always been the one who said "I love you" first. He just couldn't do it with words so he used eyes, body language, letters and songs.
English translation for non-Spanish-speakers:
And now I can only write love songs to you. Only now I can discover my love for you from here. What will you do, that now I can only write love songs to you? There's nothing anymore, nothing important anymore without you, here. And now I can only write love songs to you. And I hope that the world will manage to make us stay always like this.
Spanish lyrics:
Que ahora solo te puedo escribir, canciones de amor a ti. Que ahora solo puedo descubrir, mi amor a ti desde aquí.¿Qué habrás hecho, que solo te puedo escribir, canciones de amor a ti? Ya no existe más nada, no hay nada importante, sin ti, aquí. Que ahora solo te puedo escribir canciones de amor a ti. Y que espero que el mundo se encargue de que estemos siempre así.