It was another boring day in the gym. I had taken this new part-time job as a fitness instructor to watch women in their Lycra outfits, but I picked the wrong place.

Not one woman who entered piqued my interest.

At least that was until a woman I’ll call Monica Smith walked through the doors. She was my onetime next-door neighbor, who had baby-sat me when I was young. She was probably now 35. I spent many a long summer day staring out my window at her relaxing by her pool in a bikini. She was about five feet ten, trim and muscular. Great small tits that never saw a bra. The sight of her, along with purloined copies of Penthouse Letters, made jerking off easy.

When Monica baby-sat, it was even worse! She usually wore a halter top and a bottom thin material that was skintight. Her tits just sat there, the nipples protruding, and her pussy lips could be seen through her shorts.

To me, at maybe 14, in the thick of puberty, Monica was a goddess, and I never missed a chance to enjoy her body, then jerk off for an hour or so. She frequently asked where I always disappeared to. I just smiled.

So when Monica walked into the gym, I was in seventh heaven! She was wearing a white bodysuit that hid nothing. I watched her walk, and her butt barely jiggled as she strode toward the treadmill. Her boobs were plainly visible through the sheer fabric, and it looked like they still had no sag at all. They looked like 33Bs or Cs, with small, prominent nipples that pushed through the thin fabric. She wasn’t wearing panties under her bodysuit, and it was easy to see that she had a carefully trimmed bush with a protruding pussy mound.

I made a beeline over to Monica because I wanted to be her instructor. My tight shorts developed an obvious log.

“Hi, Mrs. Smith,” I said nervously, aware of the massive hard-on that was thickening and growing in my shorts. “You may remember, you used to baby-sit me?” I had decided to act it cool and be patient. I wanted her right then, though, and couldn’t stop my dick from awakening.

“Oh hi, Peter!” she said breezily, turning toward me and giving a sexy flick of her long silky tresses. “I didn’t know you came here. Call me Monica. You’ve grown into a strapping boy now, haven’t you? ”

“Actually, Mrs. Smith, I mean Monica, I’m a fitness instructor here.” I left out the part about being part-time, and also the part about being there only a month. “You must be new here,” I went on. “I haven’t seen you before, and I’m sure I would have noticed.”

“Why yes,” she said. “I just signed up at the desk this very morning. You know, I’m coming off a divorce, and I figured it was time to get back into shape. And also maybe meet someone.” She was looking me up and down. “A fitness instructor, eh? Well, you certainly look fit!” Her eyes lingered on my growing erection. I wasn’t wearing a jock-strap that morning because my shorts were so tight, and now I was paying for it.

“You’re in luck, Monica,” I said, “we have a special deal for new members. They get to have a one-on-one session with an instructor to get you acquainted with the machines and into the groove of the place.”

This was the sketchy plan I had come up with on the spur of the moment. Now I had to hope she hadn’t been told otherwise by other staff people or club members.

“You know, that would be really useful,” she said. “Thanks so much, Peter. I’m really glad to have found a friendly face around here. I was worried that I’d have to work with a stranger.”

Her eyes kept moving down to my strained shorts, which I was trying so badly to hide. I was pretty sure I caught a sexy smile cross her face.

“Come this way, Monica,” I said. “We have some private booths where we can get started.”

And I led her to one of the gym’s new private fitness booths — each with its own treadmill, rowing machine and bench-press and sit-up seat. I guided her through the door and turned the handle so it showed outside that the room was in use. The door and walls were opaque, so no one could see through.

I wanted to get Monica on the treadmill really badly, so I could enjoy the tautness of her body and the jiggle of her nipples. At the same time, however, I was so desperate to have her that I decided to put my plan into instant action.

“Let’s get started with some ab workouts,” I said, my hands already sweating. “Okay? It’s a great way to start a workout.”

“Yeah, sure, Peter,” she said, grinning.

“How often do you get to exercise your abs?” I asked.

“Oh, not very often,” she admitted. “I got rather out of shape after the divorce. That was just last year.” Her smile saddened.

“Oh, I’m so sorry about that,” I lied. Then I turned on the charm. “But really, you look in great shape. Are you sure you haven’t been going to a gym?”

She cracked a dick-inflating smile. Looking me over like she was undressing me mentally — at least I hoped she was! — she said, “Aw, you’re sweet, Peter. But just look at my abs!” I nearly came as she pulled up her T-shirt and kept going, stopping just before lifting it up over her boobs. Knowing she wasn’t wearing a bra, I prayed that she would keep on going. Alas, no.

I stepped over to Monica and placed my hand on her stomach, caressing her firm torso. I massaged her stomach and kept lowering my hand until it was just above her pussy mound.

“Say,” she said, “that feels pretty good,” and she pulled her T-shirt up over her head! “I don’t think I need this thing. It feels much better without it.”

“Well, you sure have a great stomach,” I babbled. I kept rubbing that stomach; my hand wouldn’t stop! At last it slid down to her upper thighs and across her crotch.

I moved around in front of Monica so I could see her better. I could see the top of her brown pubes a fraction of an inch above her protruding pussy lips. When my hands approached her mound, she reached to stop me. My dick felt like it was about to rip my shorts off.

“Um, Peter, are you allowed to do that?” she said, her nipples hardening.

“Yes, of course I am,” I said. “Would you like to see mine? You can touch me if you like.”

The instant that I pulled my shirt up, I thought I had gone too far. Monica turned her back to me and walked around behind me, and my heart sank. But suddenly I felt her hands reaching from behind me, caressing each side of my six-pack and rubbing my hard chest. I thought I heard a soft moan escape her lips.

She caressed my body a long time, then began to kiss the back of my neck. “Peter,” she said between kisses, “you’re such a man now.”

I knew the time was right. I turned around and put my hands on her abdomen again, and caressed the firm but silky flesh. Reaching up, I began to knead her hard nipples. I stood up and yanked my shirt off, then settled back down and went back to feeling her up.

She bit her lip, and then both her hands went to my ripped chest, examining me. Her hands slid down under my shorts and found my dick.

Suddenly Monica stopped and withdrew her hands, then protested weakly, “We shouldn’t be doing this. I’m so much older. And anyone could see us.”

I got up and locked the door, then said, “Look, I’m 21, and your body doesn’t look much older.” My charm button was still firmly on.

She giggled and said, “Well, if that’s the case — ”

She pulled me closer and we kissed, our tongues tangling. My right hand was in her hair, and I was lowering my left hand to make contact her pussy. As the hand was about to cup her pussy lips, she pulled it up onto her right breast. I caressed it, then kneaded it like dough until she was moaning and had to break the long kiss.

My mouth went down to her left breast and I nibbled and sucked on it, teasing Monica by biting the nipple — gently but as erotically as I could. She was breathing hard now, and she had her hands clasped tight around my back, holding me in place. I switched so that my right hand was kneading her left breast and I was sucking the right breast. Her nipples were hard, and I was flicking the one in my mouth with my tongue.

The moisture from my nibbling had soaked Monica’s bodysuit to transparency. I was leaking precome; shit, I could feel the dampness in my shorts! Soon we were both breathing heavily, and I knew it was time.

My head went down to the top of her shorts, stopping to kiss and lick her sexy tummy. When I got there, she was panting. Her bodysuit snapped at the crotch, right where her pussy had soaked a large wet spot so that her lips and clit were visible. I unsnapped the bodysuit and slowly lifted the front to reveal the beauty of her sex. Her pussy was soaked; juices were creeping down her thighs. “You’re so wet, Monica,” I murmured into her thighs. “I’ve wanted you for so long!”

“Peter, tell me, what did you used to do when I baby-sat you and you would disappear. Where did you go?”

My cheeks reddened. “The truth?” I said. “I went to my room and jerked off, dreaming of this very sight. It was so easy to make myself come, thinking of you.”

“Well, Mr. Fitness, my pussy has been juicing ever since I walked in and caught sight of that huge hard-on in your shorts.”

That was enough for me! I went to work on Monica’s pussy, determined to make her come. I started by focusing on her sexily trimmed bush. I licked and sucked on her pubes, taking my time to play with them while she panted. I teased her slit with my fingers, but I didn’t enter her. I took her clit into my mouth and twirled it around and flicked it while still fingering her slit.

She was moaning loudly now. “Oh, please finger me, Peter!” she begged. I was happy to oblige. I slid two fingers in her slowly, making her gasp. I moved the fingers slowly in and out, then went faster until I was pumping her with my fingers — in and out, in and out — while my tongue was still sucking and flicking her clit.

Her hands grabbed my hair and she moaned, “I’m coming! Oh God, I’m coming!” She convulsed violently as she came, squirting her luscious juices right in my waiting mouth. I lapped it all up, savoring her delectable taste. I continued lapping up all the juices from her pussy, using great big long licks in time with her heavy breathing. In time she fell still, breathing hard.

After a few minutes Monica drew me up, and I saw the sexy devilish grin on her face. “Maybe now I should return the favor to my big boy?” I nodded mutely; I couldn’t wait for what was going to happen!

Monica sat me on the bench and spread my legs. I raised my hips to help her peel off my shorts, freeing my rock-hard dick. “Oh Peter,” she cooed, “this is what you were packing in those shorts? We should have let this monster free much sooner.”

She put her mouth directly over my dick and let some saliva drip onto it, lubricating it for her hand. I felt her mouth curl around the helmet of my dick, and she started moving up and down it, her tongue lapping the end of it inside her mouth. Her hand slid up and down my shaft along with her mouth. She was sucking so strongly that the walls of her mouth closed around me, increasing the friction.

I began working my dick back and forth with her. I had never felt anything so sensual. She was kneeling before me. I could see her pussy juice leaking from her and puddling on the floor. I knew I wouldn’t be able to last much longer. However, her blowjob felt so good, I didn’t want to come so soon. I clenched my whole body, willing myself not to come so early. She licked and jacked off my dick for two minutes — and then she deep-throated me!

I was moaning like a man possessed, and when she took me deep, I exploded in her mouth and down her throat. I was so horny, I must have spurted six or seven big loads. Come was everywhere — on Monica’s face, in her hair, down the front of her bodysuit. She wiped her face off as best she could and turned around to look me in the face. Instantly we started kissing again.

Suddenly she pulled away, and I saw that sexy look in her eye. “Peter, I want you to fuck me,” she hissed. “Right now!”

All I could do was obey!

I stood up and guided Monica onto the bench. She straddled the seat and slid down to the end so I could enter her. I guided my dick, which was steel-hard again, into her inviting pussy. She gasped. I slid slowly in and out of her, and she moaned as she took my full length in her. I sped up, with each thrust making a small squishing sound in her pussy.

Soon I reached full speed. I was really pounding Monica, and she was moaning loudly, “Fuck me! Oh Peter, fuck me!” Fortunately, the walls were soundproof! She groaned as I slid in and out of her, my full length doing her on each stroke. “Oh God, Peter,” she groaned. “I’m coming! Ahhh!” I kept on pumping her until her legs spasmed in another climax.

I was just about there, but I still wasn’t ready to come. I picked Monica up and pressed her back up against the wall, then fucked her again, hard. She moaned louder and louder as I kept pounding into her up against the wall. “I’m — going — to come — again!” she cried. Her moans took me over the edge, and I lost control. My dick thrust into her one last time, as deep as it would go, and I exploded inside her pussy. She screamed out the ultimate pleasure of her orgasm.

We both sat back and panted, exhausted — but we weren’t finished! Monica got up and leaned against the wall. Bending a bit, she was presenting her fine hard ass to me in a sort of standing doggie position. As I moved up to her, she said, “My husband used to do my ass like this,” she said, “and I loved it! Would you take me, Peter?”

“Just so you’re sure, Monica,” I said, concerned about taking advantage of her when she was in a state of such uncontrollable lust.

“God, yes!” she cried. “I wouldn’t ask if I wasn’t sure. I’ve been so lonely, and this feels so right. But be gentle, it’s been a long time.” She sounded embarrassed.

I knew I had to do this. She was offering me something so precious, I could not refuse that beautiful ass. I walked over to her and, with my dick still coated with my juices as lube, slid slowly in her ass. She immediately clenched, and my dick was caught in a viselike grip in her ass. She didn’t want to let go of me — and I didn’t want her to!

I pushed slowly in and out of her. It felt so good, I knew I wasn’t going to last long. Monica’s head was down and she was moaning. I reached around to tease her nipples and felt her hand on her pussy and her fingers inside while I probed her backside.

“Harder!” she moaned. “Fuck me in my ass harder! Harder!” I increased my speed, and knew I was going to come. I had never come a third time, but her ass was doing magic to me that no girlfriend had ever done. I built up to my climax quickly, and when I came, we came simultaneously, and violently.

We ended on the floor again, exhausted in each other’s arms. We kissed, long and hard, and I knew I wanted her for keeps.

After several minutes Monica stood up, then dressed and left the gym, calling this her “best workout ever.” I was happy, yet worried that she would forget about me. But she didn’t. The next morning she called to see if I made house calls, and asked if she could possibly get some “private instruction”?

Do I really have to tell you what the answer was?