Pi Day is March 14th, ie 3.14 as in the first three digits of the mathematical constant pi. (3.14159...)

/takes off math professor hat

__________________
I see your fantasy... you want to make it a reality

Are you in the mood to be subdued

You see these shackles
Baby I’m your slave
I’ll let you whip me if I misbehave

Tie me to the bedpost

I like it rough
cause I'd rather feel pain than nothing at all