...and I'm about to blow!

I hold back my climax for as long as I can, savouring every moment my cock continues sliding into Sister Mary's throat. Eventually though my will gives out!

"Here.....it........CUMS!!!!" As I scream out the last word my dick gives a large spasm between her lips and starts to unload it's boiling hot contents!

Sister Mary closes her eyes as her mouth fills with seed. Quickly filled, her cheeks bulge as sperm escapes around my throbbing shaft and runs down over her fingers. She starts swallowing but it's not enough. Cum continues to fill and refill her mouth as I empty a week's worth of build up into her. It feels like my whole being is pouring out through my dick!

"YES YES!" I yell as my balls continue to empty themselves into Sister Mary's gullet. Soon she can swallow no more and lets go of my cock as she pulls back. This time I don't stop her and as my dick exits her mouth she takes in a mouthful of air.

"*cough* Oh my..." She manages before another spurt of thick cum splatters against her face. "Ack! How are you still...?" She begins before another wave of liquid collides with her veil.

Deciding she'd be better off not speaking she tries instead to avoid the many ropes of seminal fluid flying towards her. However at such a short distance and with the desk preventing her from retreating backwards her attempted avoidance instead ensures a greater volume of cum on her person than if she'd remained still. After what seems like a long time my cock finally stops. Sperm drips from the it's end splashing down onto Sister Mary's chest who, realising I've finished, looks back at my dick. Still breathing heavily she remains silent for a few moments, recovering her composure as cum drips down her body.

"*Ahem* Well, that....that appears to have been effective."

"Ah-huh" I say wearily from my seat.

"You seemed to lose your control a little during the massage." She says, her eyes moving from my still dripping dick up to my face. "You wouldn't even let me speak..." A small spike of guilt pricks my insides but the intensity of my postcum bliss eclipses the feeling almost instantly.

"Yeah I know..." I say choosing my words carefully before I continue. "...but I did tell you my tension could come back at any point."

"Yes you did..." She replies. "...and I suggested we skip the massage this week." She suddenly looks sad and ashamed, her cum spattered face lowering slightly. "Thank goodness you pushed for one, otherwise who knows how next week would have been for you.". Looking down at the cum plastered to her habit she smirks slightly before saying "I'm going to run out of clothes at this rate...". That thought rejuvenates my slightly softened cock as I feel both my stamina and desire returning rapidly. Sister Mary begins to get up from the floor and as she straightens I notice that the skirt of her habit has pulled up slightly, revealing her underwear.

"Uhh...." Escapes from my mouth as I stare agape at the skimpy material, blood pumping rapidly away from my brain towards my once again towering cock. Sister Mary, noticing her indiscretion, takes in a small breath and quickly slips her robe back down over her legs.

"Sorry! I didn't realise that had happened." I barely register what she says. That small glimpse of her small black undergarments has awakened something primal inside me, this inner feeling expressed outwardly by the throb of my insistent penis. "Is your thing not going down?" She asks looking at my rock hard cock, the familiar vein pulsating along its impressive length.

"No..." I say trying to remain in control of my body.

"Oh dear..." She says looking concerned before asking...