for leno a lot of the songs i associate with him are associated for leno with his feelings toward faust 0:

and there's this one song that i heavily associate with that every time i listen to it and it's "Quiero Ver" by Cafe Tacvba !

Quiero ver tu risa todo el día
Escuchar la melodía de tu voz
Quisiera ser el brillo de tus ojos
El peine que desnuda tu esplendor
La esquina que te ve cuando caminas

(I want to see your smile everyday
Hear the melody of your voice
I want to be the light of your eyes
The brush that undoes your splendor
The corner that you see when you walk)

La forma de tus labios
Y quiero ser tu último dolor
Te pido que me cures esta herida
Yo sé muy bien que no es tu obligación
Tan solo si amortiguas mi caída
Será mi salvación

(The shape of your lips
and I want to be the last person to ever hurt you
I ask that you heal me of this wound
I know very well it's not your obligation
I only want you to soften my fall
It'll be my salvation)

Prometo intentar no hacerte daño
Prometo darte todo lo que yo
Prometo regalarte sin reparo
Mi corazón

(I promise I'll try not to hurt you
I promise to give my everything to you
I promise to gift you my heart without hesitation)

*I wasn't sure how to tl this part but i think it's more literally translated as "I want to be your last pain" but i also have 0 song tl'ing experience so i'm unsure which would fit LOL
I'll link the song in the tweet :>