His Tongue and The Librarian's Pussy

I work in a library and I’m doing some boring tasks when I’m approached by a customer. This handsome stranger flashes me a broad smile and I have a few seconds to take it in. I feel an immediate attraction. Without realising, I bite my bottom lip and cross my legs as my pussy tingles.
“Can I help, sir? Would you like to register?” I ask, locking eyes with him on the ‘sir’. My pussy tingles again and I squeeze my legs together. He's hot and exactly my type. I try to remain professional, but he catches my eye and smiles and winks.
He’s talking. His accent’s cute and his mouth is hot and I can’t concentrate on what he's saying. All I can think about is that tongue in my pussy. I offer to take him to the basement for obscure stock.
The basement is dark and full of tall shelves. He looks around slowly and then points up to the highest shelf.
I pull a ladder round and climb up. He grabs me round the waist and buries his face in my ass. He bites me hard through my skirt, forcing me against the shelves. I open my thighs and he groans as he reaches my soaking underwear.
“I knew you were a bad girl” he whispers, teasing my clit and rubbing my nipples through my bra. I cry out and he smacks my ass hard and tells me to “fucking shh, it’s a god damn library, isn’t it?!” which makes my nipples harder and my pussy swell.
I pull my skirt up and he begins worshipping me – biting, licking and slapping my ass as his finger is still gently circling my throbbing clit.
The sweat is dripping off me and my heart is racing. “Please, taste my pussy” I beg. Without hesitation his tongue dives right into me. I bend and reach over the shelf so he can get in further. His entire face is in my ass now and his tongue is going from deep into my pussy to hard flicks across my clit.
I can feel the blood rushing to my head, but I don’t want it to stop. I don’t want to cum yet, but I no longer have any control over my body. I orgasm hard against his face. He licks me up, dresses me, helps me down the ladder, grabs a book and leaves.