I was completely 100% straight. The thought of doing anything
with another man was a turn-off.
My new Mistress informed me that she
wanted me to suck cock and swallow cum. I was genuinely horrified.
I informed her that I wasn't into that at all.
She asked me if it was a hard limit, and I hesitated before
answering yes.
She picked up on the hesitation and offered me a deal.
If, by the end of the night, she could make me say "Mistress I want
to suck cock and swallow spunk for you" I had to do it. If I hadn't
said those words by the end of the night I would be allowed to remain straight.

Mistress tied me to the bed, a couple of pillows placed
under my bum and my legs spread-eagled.
She blindfolded me and left the room.
My cock was twitching, semi erect in excitement.
She returned several minutes later.
I heard a whooshing noise just before I felt a stinging pain
on my right thigh. Mistress was obviously using some kind of whip on me.
"You are not to cum, do you understand me?" she stammered.
"Yes Mistress." I replied.
"I’m serious bitch. Don't you dare cum! If you cum I will bust your
balls".
With that I felt an agonising pain in my ball sac, I screamed out loud.
I was whimpering, tears in my eyes.
Mistress had slapped my balls, but not just a little playful slap, a full on severely hard whack.
My balls were aching for several minutes, I was shocked and scared.
"Just a little demonstration. If you cum I will give you 10 of those."
The thought of even one more was unbearable. There was no way I could take
more, I think I would have blacked out after two.

Mistress began to lightly touch my cock, running her fingernails
up and down and over my balls, but barely touching me.
Within seconds the pain in my balls disappeared and my cock was rock hard.
The teasing continued like this for many minutes.
"If you feel close you tell me slut". She informed me.
She dragged her finger over my asshole and I let out a moan
of pleasure.
"Ohhhh, you liked that did you slut?" she asked.
"Oh Yes Mistress" I replied.
"I bet you'd like me to play with your asshole wouldn't you straight boy?"
she sniggered.
"Yes please Mistress." I whimpered.

She continued teasing my cock and balls, occasionally licking me.
It felt amazing.
I felt something cold and wet on my asshole.
Then felt something being pushed against it.
I tried to relax and the object started to ease my ass open.
Slowly Mistress edged the plug up inside me, I was moaning in delight.
I felt my tight ass being stretched open. I could feel it getting deeper
inside my body. It felt sooooo big. It was actually pretty small.
With one last push I felt my asshole close back up, It felt like my ass had swallowed the object up.

The teasing on my cock and balls continued, Mistress was stroking me
properly now, wanking me off.
She took a firm grip and slowly pulled my foreskin up over my
glans on the upstroke, then yanked her hand down hard, slapping my balls with the base of her hand and stretching my frenulum to breaking point.
She repeatedly this over and over.

I felt the plug up my ass come to life, it made me jump. The vibrations felt so good.
I was moaning and groaning as the teasing went on and on.
I felt a cold liquid dripping onto and down my cock. Mistress had decided to use some lube to take it to another level.

She started stroking me, sliding her hand up and down my soaking wet cock, twisting it at the same time.
I couldn't take this, it was too much.
"Mistress I'm close" I murmurred.
She stopped what she was doing, Let go of my cock and turned the butt plug off.

After a couple of minutes she started again.
This whole thing was repeated over and over.
"I know your desperate to cum slut aren't you? All you have to do
is tell me you want to suck cock and swallow spunk, and I'll let
you cum". She told me several times.
After an hour of this torment the cum in my balls was boiling up.
I was panting and groaning, straining in my restraints. I couldn't
take it anymore, I had to cum.
"Please Mistress". I begged.
"Please let me cum Mistress, pleasssseeeee". I pleaded.
"Tell me what I want to hear and I'll wank a huge load of cum up
from your balls".
Oh god I was in sexual overdrive, the torment, combined with her dirty talking, was too much.
I couldn't control myself any longer...
"Mistress I want to suck cock and swallow cum" I blurted.
With that she laughed out loud and stroked my cock some more.
"You have my permission to cum cocksucker". She purred.
I shot a huge blast of cum all over myself, spurt after spurt shot
out my raging hard-on. It hit my head, my chest, belly, I was covered
in my own sperm.
I'd lost the deal.
"I'm going to turn you into a cocksucking, sissy, faggot cumslut".
She laughed.
What had I done?