That's Were I Belong by Gilbert O'sullivan

Twist me round your little finger
Wrap me round your thumb
Give me what it is i'm after
Make me feel i'm the one
And anytime you need a friend
I'm yours to lean upon
'cos where you're going i am too
That's where i belong

Sentence me to life in prison
But grant me one request
See to it there's no remission
And be sure it's your address
Build me up or put me down
Whatever turns you on
'cos where you're going, i am too
That's where i belong

I'll love you true
I'll love you fair
I'll love you when you're old
And not just care
I'll love you now right here, and yes
Although i love you in so many ways
My favourite is undressed

Give me hope where once was fear
Don't keep me holding on
'cos where you're going i am too
That's where i belong
'cos that's where (that's where i belong)
I belong with you
That's where i belong