[Verse 1 - Chell]
I can tell that you're a simple box
You've no heart besides your painted coat
How could it be you're important to me?
I don't think I could ever let you go

[Verse 2 - Companion Cube & Chell]
We're a pair, we're complete as two (You're all I need)
We're both portals, you are orange, I'm blue (Indeed, and I will love you)
We are a team, not as strange as it seems
Chell, it's true, I will always be your cube (You're my Companion Cube)

[Chorus 1 - Chell & Companion Cube]
Companion Cube (Use me for your goals)
You can't be real, Companion Cubе (Stoke love's burning coals)
Your hearts of steel, Companion Cubе (Though I have no soul)
You make me feel, Companion Cube (I can make you whole)
You're all I've got, Companion Cube (Dare to live today)
You're all I'm not, Companion Cube (Carry me away)
You're in my thoughts, Companion Cube (I'm fifty shades of gray)
We'll always be companions, cube

[Verse 3 - Companion Cube & Chell]
I will hold the door for you (When I feel down, when I'm sad, when I'm blue)
But I pray that you'll take me, too (I remember you're with me companion cube)
I have no fright from the turrets we'll fight (Every room that we pass)
Only please don't forget companion cube (Is a chance for our romance to bloom)
[Verse 4 - Chell & Companion Cube]
So much warm in my heart when I hold you (Like a lemon burst into flames)
And I know love's still alive! (Lights my heart when I hear your name, your name)
You're my cube, and will always be (I will be your friend ‘till the very end)
Whether either of us can still survive (Of the cutscene completing the game)

[Chorus 2 - Chell & Companion Cube]
Oh, please be my Companion Cube (Keep me by your side)
It's you and me, Companion Cube (Be my portal bride)
You make me squee, Companion Cube (Love can't be denied)
For Portal 3, Companion Cube (Wedding cake's a lie)
You've done your part, Companion Cube (GLaDOS got us wrong)
You're in my heart, Companion Cube (Our love's burning strong)
This might be hard, Companion Cube (I wrote you this song-)

[Outro - Chell]
We'll always be companions, cube