The Suck of the Physical Assessor

I've been wanting to get back into the gym for a while now, but with all this office hustle there was no time. I leave very early and when I arrive it is already quite late, which makes dawn my only available hour. Luckily they opened one near my house that works at those hours so I didn't delay and rushed through in the morning to enroll myself, making an appointment to return and train that same night.
When I got home from work, all I wanted to do was take off my suit and put on a comfortable Bermuda shorts. I don't wear underwear at home because my dick also needs breathing after being squeezed all day long. I made my snack good and already thinking about sleep when I remembered the gym, having to put on T-shirt and sneakers for running. On the way out, even thought of putting on some panties but gave up eventually, by that time no one would notice.
I was in the gym, working on my chest and back when the instructor walked up to me checking out his workout.
All right, I can see that you're used to training.
I'm starting today.
My name is Fernando, I'm the instructor here and since it's your first day you have to pass an evaluation so we can monitor your development.
I'd forgotten that some gyms had this, but it is really important so I followed the guidance and went to the classroom.
"Please close the door", I said as soon as I walked in, and take off your shirt.
He started by adjusting my posture, aligning the shoulders and massaging to relieve tension. Then he took a tape measure and began measuring the circumference of each muscle with his hand as if checking its texture and rigidity too; it went through the biceps, triceps, pectoral area, waistline so that when it broke into my thigh, I was already in an awkward excitement.
"I'm gonna need you to climb the short bar", he says, looking down at me with one of his knees resting on the floor.
I try to act naturally, disguising the unconcealed by holding my cane sideways with one hand and pulling on the bar of his shorts with the other. The instructor still tries to help by adjusting the bar, gripping it from inside the thigh but making things worse every time I feel his fingers reach for my groin. Then he pauses a while and breathes in.
- It's not gonna work like that.
- It was bad, but I'm out of underwear.
- No problem, no one's coming in here quietly as long as you lock the room door from inside.
I take off my shorts and my dick practically jumps out. The instructor pulls a chair closer, asking me to support one of his legs while he kneels in front of me. I look up, running away from eye contact, looking for something non-erotic to think about but it's useless.
I feel the ribbon wrapped around my thigh, and then it's going down to the bottom of my hip extending from the glutes all the way up into my knee.
That's it, keep going.
With each contraction, my dick pulsates with more blood and its tip seems to touch something, getting closer and closer. I only realize it's the tongue and mouth of the instructor when he finally swallows my cock all the way down, holding me at the bottom of his throat for a long time. He lets go so that I can catch my breath and see my penis covered in his saliva, ready for him to grab hands and start punching. The vicious one alternates with licks all over the member, going from head to sack and sucking a mouthful of gulp like no girl ever does in an uncontrollable thirst for my fucking drink making it impossible any other action but fulfillment.
That's when I grab the instructor by his neck and start fucking that mouth, like I haven't fucked anyone in a long time. He just grabs my thigh and lets my dick have fun going fast or going really deep making even more saliva run down the corner of his mouth also covering the board on the floor breathing speeds up, my body twists and the hardness is so much that I can even mock at this wet throat but hold myself to prolong that feeling
I sit in the chair and let him use a little bit more of his blow-job technique, he falls on my dick with his mouth while sliding his hands down my abdomen, groping until it reaches my breastbone where it tightens and twists my nipples making my penis even harder than before.
- I'm coming! he says, without stopping the movement in my dick, testing my silence.
He picks up the board from the floor and stands, placing it on top of the table looking like he's really going to leave me at ease but now there is him with his back down pulling his trousers. I don't expect anything else so I get up pushing him over the desk and taking advantage of the opening in the rear part of his underpants to stick my pencil into his ass. The lumpy cane goes tastefully through that hole which adjusts itself to grab onto its entire length. I start fucking that ass, pushing the guy's head against the table but he lets out a louder groan and I have to lift up his trunk bringing him close to me covering his mouth with one of my hands while holding it by its belly in place for potty training whilst catching his dick slipping through her panties at every hard thrust drooling as much as the owner.
My breathing speeds up, my body twitches to indicate that the end is coming. We can't take much longer. The table already vibrates at stroke rhythm and the instructor writhes and groans in a way we cannot count it any more. I can not stop now and he doesn't want me to stop because he grabs my butt and asks me to fuck more. He asks again, gripping harder and moaning. I follow his command and accelerate faster, deeper sweating, trying to show off my best performance until finally he laughs and has lots of fun without even taking the stick spreading across the table. I'm almost there too and can't slow down, so I forcefully bring him closer to my chest, holding his sputum while finishing the service.
All my muscles are working and tensing. They want to make fun of that ass, but what the instructor wants is to swallow my cock. I take it off just before while he crouches down and I rest my hands on the table letting him finish milking. I can't hold back and start moaning loudly and long at the same time as enjoying myself in the teacher's mouth. Everything on the desk vibrates along with the spasms of my body and the kid keeps licking and sucking until extracting the last drop.
I stood there for a while, leaning against the table and recovering myself from watching him pull himself together to clean everything with his own underwear. When he finally opened the door, I was still shirtless finishing up adjusting my shorts. The janitor waited at the door for cleaning and seemed to know what was going on in there, which was immediately confirmed by mealy-mouthed panties that could be seen in the trash can and my stick sticking out of my bombshell in short pants.
"The next time you come, we'll finish the evaluation", he says and hands me his shirt.
"Beauty", I say with some confusion.
I'm just gonna get out of here and go straight home.