She's fat and ugly, but my god I can't resist when she tells me that she wants to swallow my spunk.

I'm a happily married man who works as a teacher and she's a 'lesbian' teaching assistant, which works brilliantly for cover as nobody expects that she's sucking my cock and balls when we work late into the evening.

Her blow job technique is exceptional and she swallows every drop which just turns me on no-end.

She often whispers how much she wants my thick cock in her mouth when she brushes past me in class or the corridor, and she will take any opportunity she can to stroke my bulge under a table or in the store cupboard.

She's a pure nymphomaniac, and she often tells me how she wants to be used: she wants to be gang-banged until every orifice is sore and her body is coated in cum.

I know I shouldn't be engaging in activity with her, but, my god, the thought of her thick lips enveloping my cock is just too much to bear!