Me and my big cock and my girlfriend's mouth

My girlfriend is such a little treasure,
when I'm feeling under the weather,
Like 'Mars' she gives me the pleasure,
That you can't measure.

Speaking of 'measure' I'm about 8.5 inches,
She sucks most and the rest she pinches,
It gives me these electric twinges,
When we're finished, her jaw aches and she whinges!

In her mouth is where my cock gets put,
She takes it in turn to play with each nut,
In bed she can be such a little slut,
That's why her and me are staying put.