(silence...)

I don't answer, feeling that trying to say anything would unleash the animal lust within me. After a few more awkward seconds of silence I manage to muster up a small croaky sound.

"Oh, your throat sounds very sore." She leans forward to feel my forehead. "You're very hot too, you must still be slightly ill." At her touch the beast inside me roars, **** for me to reach out and grab her. Sister Mary gives me and my cock a concerned look, sperm still glistening on her cheeks, before continuing, "I don't think you're very well. Perhaps the **** release from the massage has weakened you.". Still I say nothing, but my blood boils with barely restrained lust. She straightens up, the immense cum-stained swell of her breasts level with my eye line. "Let me get you a glass of water and then I suggest you go and get some rest." She turns away, beginning to move towards the jug of water on her side table. As she does her body is perfectly profiled in my vision. Her giant tits and her large bum are tightly wrapped within her messy habit. The sight finally breaks any residual resistance within my being. As she walks to the jug I spring up from my chair and, my cock pointing the way, quickly rush up behind her. Before she can react I reach out and grab her arms. "Wha...?!" She exclaims as my cock presses up against her behind.

"I...need....more..." Is all I can manage, my ears ringing as my brain relinquishes control of my body. Acting of their own free will my hands make their way down to her skirt and begin to pull it upwards.

"What are you doing?" She asks, shock and fear clear from her tone.

"Sorry, but....I can't stop it!".

"I don't understand..."

"My cock needs more!!"

"Your....cock?" As she asks this I finish lifting her skirt. I see her butt, its fat cheeks squeezed into the black undergarments that began my lust-fuelled advances. "Hey!" She says as she realises what I've done. In response I push her forward, making her butt look even better.

"Oh wow..." I say surveying the ample flesh before me.

"Now, please, you need to stop, this is not appropriate..." Sister Mary says, although she makes no efforts to free herself from my grip. Still keeping one arm clasped in one hand I move the other down to have feel of her rear. My fingers start to caress the milk white rump, squeezing every so often and causing Sister Mary to squeak in indignation. "Please...eek!....Don't do that...". Eventually I do stop my fondling... "Oh thank you..." She begins before squeaking again and saying "...eek! Is that your...?".

"Ah-huh!" I say, rubbing my solid dick along her gap between her cheeks.

"Mmm, this feels good..." I say moving my hips back and forward, still gripping Sister Mary's arms in my hands as she shakes slightly with fear. "...don't worry, I'm not going to hurt you. I just need to cum again!". Even after unloading an already large amount of jissom I can feel how heavy and swollen my balls still feel. Apparently I haven't released all that I need to.

"Cum....?" Sister Mary says questioningly before gasping. "The letter! Is that what we've been doing? Some of the things that vulgar man desired?" A shudder runs through her body causing her butt cheeks to jiggle deliciously against my still thrusting cock. "I feel so dirty..." She says dejectedly. "...how could I be so foolish..." While she comes to these various conclusions I continue to enjoy the sensation of her ass against my dick although I can feel my body guiding me to other possibilities...