Lyrics:

Sans:
It's a beautiful day outside.
Birds are singing, flowers are blooming...
On days like these, kids like you...
Should be burning in [bad word] 
Turn around kid, it'd be a crime,
If I had to go back on the promise that I made for you,
so don't step over that line,
Or else, friend, you're gonna have a bad time

Chara: But guys like you are always just fools
 [bad word] at me, try to kill me with your fancy tools
Sans: Let's go, let the room get chiller...
Sans: Lets go dirty brother killer.

Sans: Go ahead and try to hit me if you're able,
Chara: But inside you know the end can't be evaded
Sans: I can tell you're getting really sick of trying,
Chara: But I [bad word] back after dying

Chara: Why not let me win? You can't dodge forever!
Chara: Even if the pain is more fun together
Sans: I know you just reset each time I beat ya',
Sans: But I'll always be right back here to meet ya'

(Chara / Sans) (I am made / I know you're made) of LOVE, LOVE...

Sans: This is where it stops, This is where it ends
Chara: You keep telling me those words and hope that I would understand
Chara: But even if I hear you I won't give up my attack
Sans: Do you just like the feeling Of your sins CRAWLING on your back?

Chara: Go ahead, kill me again I see you're able
Sans: You should know by now that mercy's off the table
Chara: You think I might decide to stop if you stay patient
Sans: Well, you didn't spare my brother, so GET DUNKED ON!

Chara: You know I made your friends all disappear
Sans: But everything they cared about is why I'm here
Sans: I am their mercy, I am their vengeance, I am DETERMINATION

Chara: I'm entirely made of
Chara: LOVE
Both: LOVE
Sans: But I think I'm stronger than you

Chara:
L O V 
I am STRONGER than YOU
L O V