The Class That Ignited My Most Forbidden Fantasy

I’m Valeria, and if there’s one thing I’ve learned about myself in these last few months, it’s that I have no problem admitting what I want. I’ve always liked older men, the kind who walk into a room calmly, without needing to make noise to be noticed. My friends used to tease me about it, saying it was a weird taste for someone my age, but I never paid them much attention.

That Monday in March I arrived in class with that conversation still spinning in my head. Before going in, one of my classmates told me we had a new teacher. A substitute. He was going to be staying for a long while because the regular teacher was planning to quit before the end of the year. I didn’t think much of it. Substitute teachers were usually boring, insecure, or too young to take seriously.

The teacher walked in ten minutes after the bell rang.

When I saw him, I understood why my classmates had gone quiet as soon as he crossed the door.

His name was Santiago. The first thing I noticed was his shirt: white, with the sleeves rolled up to his elbows, slightly snug across the shoulders. Not in an exaggerated way, but in that way that tells you someone works out and doesn’t need anyone to notice. His forearms had visible veins, his hands were large, and when he started speaking, his voice was deep but calm, with no effort at all. The kind of voice that doesn’t need volume to fill a room.

My classmates asked him the usual questions: where he was from, what he had studied, whether he had a girlfriend. He answered with a brief, partial smile, the kind that doesn’t give everything away but doesn’t quite close the door either. I didn’t ask anything. I stayed looking at him from the third desk, elbows on the table and head slightly tilted, pressing my thighs together under the desk because I could already feel my panties getting wet just from looking at his hands.

I wasn’t about to waste that angle.

The following days were more or less normal. We had class with him on Mondays and Fridays. Tuesdays, Wednesdays, and Thursdays began to feel longer than usual. I didn’t notice it until Thursday afternoon, when I started thinking about Friday. I found myself choosing my clothes more carefully, rehearsing answers to possible questions in class, imagining little situations that were never really going to happen.

Or so I thought.

The next Friday I got up early. I showered slowly. I chose the dark blue blouse, the one with the neckline right on the edge between presentable and the kind of thing that makes people stare. Not over the top. Just enough for anyone paying attention to notice. My tits are big, and that blouse did nothing to hide it, which, if I’m honest, was exactly the point. I looked at myself in the mirror in my underwear before getting dressed and touched my nipples for a second, imagining it was him doing it. They got hard instantly.

That day I actually paid attention in class, not only because of him but because the topic was genuinely interesting. Santiago explained with concrete examples and without that tendency some teachers have to complicate simple things to seem important. When he asked me to answer a question, I did it without hesitation. I saw him lift one eyebrow slightly.

—Good —he said.

Just one word. But the way he looked at me when he said it was enough to make heat bloom in my chest and a direct throb between my legs, that hot pulse that made me press my ass against the seat.

After that I went up to his desk under the pretext of a question about the assignment. The question was real, though. But I also knew perfectly well how I was standing when he started explaining: leaning slightly forward, elbows on the edge of the desk, my eyes on the paper, the neckline open right at the level of his eyes. Santiago explained. His eyes went to the paper, then to my face, then dropped for a second to the valley between my tits before returning to the paper. Fast. Almost imperceptible. But not to me.

God.

I looked up just in time to see him turn his eyes forward, as if nothing had happened.

—Is that clear? —he asked.

—Perfectly —I said.

I smiled as I walked back to my desk, with my panties now frankly stuck to my cunt.

***

At recess, my friends and I were allowed to stay inside the classroom. I pulled out my phone and used the chance to lean against the back desk, facing the wall as I read messages. Without thinking too much about it, I bent over my forearms while I read the screen. It was a comfortable position. My upper body almost horizontal from the waist up, my weight spread across my elbows, legs together and straight, my ass lifted and the short skirt pulled tight across my cheeks.

I didn’t think too hard about what it looked like from behind.

Or maybe I did think about it, a little.

I heard the door. Footsteps. Santiago walked straight to his desk, unhurried, with that calm he seemed to have for everything. He bent down, searched for something in the bottom drawer, found it. And before turning around, he looked at me. I looked at the bulge in his pants for a second before lifting my eyes, and it wasn’t my imagination: there was something there that hadn’t been there before.

He didn’t look away right away.

Neither did I.

There were exactly two or three seconds in which neither of us did anything. Then he smiled in that way he had, that smile that was almost an unfinished question, and left the classroom without saying a word.

I stayed still for a moment, breathing strangely and with my cunt pounding so hard I was embarrassed it might show.

Jesus Christ.

***

That afternoon I got home and I was alone. My parents weren’t due back until night. I took off my shoes at the door, left my backpack on the desk chair, and threw myself onto the bed on my back with the ceiling as my only point of focus.

Two seconds. That smile. The bulge.

I slowly ran a hand over my neck. Not because I was cold. I let my fingers slide down to the first button on my blouse and unfastened it. Then the second. I closed my eyes, and there he was.

In the fantasy I started building, Santiago didn’t smile. He looked straight at me, serious, with that calm he kept even when he said something that threw you off balance. We were in the empty classroom. It was late. The hallway light slipped in through the crack under the closed door.

—I knew you’d stay —he said.

I didn’t answer. I walked toward him slowly, my heart in my throat, and he didn’t move. He only waited. When I was a step away, he lifted one hand and took my chin, raising my face.

—What did you think you were going to get out of that? —he asked in a low voice.

I swallowed.

—I don’t know what you’re talking about.

A long pause.

—Of course you do. With that blouse. With that ass pointed at my face during recess. You know exactly what you’re doing.

He turned me slowly, without roughness but with no room for doubt. His large hands on my shoulders, my back against his chest. I could feel the heat of his body before he even touched me properly, and I could feel his hard cock pressing against my ass through his pants. He put me facing the desk and pressed against me from behind, firm, unhurried, rubbing once so there wouldn’t be any doubt left in my mind.

His hands moved down my arms, reached my hips, held me there for a moment as if assessing something only he knew. Then they went up and grabbed my tits over the blouse, squeezing with his open palm, searching for my nipples with his thumbs until he found them hard through my bra.

—All week long, teasing me —he said against my ear. His voice even deeper now, closer—. You thought I wouldn’t notice how you squeeze your legs when I look at you.

—I knew you noticed that you noticed —I answered.

I felt him laugh very softly. Not a laugh. Just that deep murmur in his chest vibrating against my back.

Then his hands moved. One unbuttoned the blouse one button at a time, unhurried, while the other slid down my stomach, slow, deliberate, and slipped under the waistband of my skirt. Not rushed. Like someone who already knows exactly what they’re going to find and doesn’t need confirmation. I rested my open palms on the desk and closed my eyes.

His fingers reached the edge of my panties first and then slipped underneath. When he touched my cunt directly, I bit my lip to keep from making a sound. I was soaked, dripping, and he knew it without needing to say so. He slid two fingers between my open lips and moved them from top to bottom, smearing himself with what came out of me, until he reached my clit and stayed there, drawing slow, precise circles.

—Such a wet little slut —he murmured—. Look how it’s dripping off you. And this is only the beginning.

He pushed one whole finger in, then two. He curved them inside, searching for that spot that made my knees buckle, and when he found it he started moving slowly, with precision, unhurried. His other hand covered my mouth gently. Not to silence me by force, but as a clear warning. Not yet. Not yet make a sound.

With his thumb he kept working my clit while the two fingers went in and out of my cunt with a wet, obscene sound that filled the silent classroom of the fantasy. I pushed my ass back against his hand without even realizing it, wanting more.

—Stay still —he said—. I decide when you come.

On my bed, I already had my fingers where he had them in the image I was building. My panties shoved aside, two fingers sunk into my cunt and the other hand squeezing a tit from beneath my lifted bra. Eyes closed. Breath coming in broken little bursts. Keep going.

In the fantasy, Santiago yanked his fingers out when I was right there, on the edge. He turned me against the desk and looked me in the eyes while he brought his shiny fingers to his mouth and sucked them one by one, never breaking eye contact.

—You taste fucking delicious —he said—. Get on your knees.

I obeyed. I lowered myself to the cold floor, between him and the desk, and unbuckled his belt with trembling hands. I pulled his pants down to his knees and then his boxer briefs. His cock sprang out, thick, hard, the head already wet. Bigger than I’d imagined.

—Open your mouth.

I opened it. He grabbed my hair with one hand and guided his cock inside slowly, resting the tip on my tongue first, letting me taste it, and then pushing deeper. I closed my lips and started sucking the way I knew how, pressing my tongue against the frenulum, bobbing my head up and down, swallowing around him.

—That’s it —he said—. Take it all. Come on.

He pushed my head lower, deeper, until the tip hit the back of my throat and I gagged. He let me breathe for a second and pushed again. Then again. And again. Setting the rhythm with his hand on the back of my neck while I drooled over his cock and over myself, my eyes watering and my tits hanging out of my bra.

—Good girl —he murmured—. You learn fast.

Then he pulled me off his mouth, hauled me up from the floor by one arm, and turned me against the desk again, now with my blouse open and my pants around my ankles. He unfastened my skirt with one hand and slid it down slowly. Then he did the same with my panties, yanking them off when they got tangled at my knees. He left me there, naked from the waist down, with my torso bent over the cold desk. The contrast between the cold wood under my tits and the heat of his body behind me was so concrete I could almost feel it for real.

—Hands still —he said.

—Yes.

—Yes what.

A pause.

—Yes... sir.

I felt him tense behind me. As if those two words had changed something in the air between us.

—Good. Now hold it.

What came after was slow at first. Every slap of his open hand against my ass was precise, controlled. One. Long pause. Another. Pause. I clenched my teeth and gripped the edge of the desk, focused on not letting a single sound out. Each time I managed it, the next one came a little harder, as if he were measuring my limit. Looking for it. Between spanks he ran two fingers through my soaked cunt, slid them in and out, left me right on the edge, and when I was about to come he landed another sharp smack that knocked the orgasm right out of my fingertips.

I have no limit for this, I thought at some point, knuckles white and forehead pressed to the wood, ass burning, cunt dripping over my own thighs.

When he was done spanking me, he took my hips and held me for a second. I could feel his rock-hard cock resting between my red cheeks, sliding up and down over the wetness dripping from me, without entering me yet.

—Do you still want me to teach you? —he asked.

I turned my head to look at him over my shoulder.

—More than ever. Put it in me, please.

—Please what.

—Please, sir. Fuck me.

He moved without another warning. He drove his cock all the way in with a single thrust, to the hilt, and the sensation was so intense I opened my mouth without making a sound, eyes squeezed shut. He covered my mouth with his palm, firm but not crushing, and started moving slowly at first, with the weight of someone who knows exactly what he’s doing. Every thrust measured, deep, with that patience he had for everything and which in that context was almost unbearable. I could feel him pull almost all the way out and then slide back in to the root, unhurried, marking every centimeter.

I was melting against the desk, my tits flattened to the wood and my ass lifted, seeking him.

—Look at how you clench —he murmured against my ear—. Born to get fucked like this.

Then the cadence changed. The hands on my hips tightened, fingers digging into my skin. The rhythm became more direct, less patient, with something urgent mixed into what had been pure calm before. The desk started to screech against the floor with every thrust. I could feel him reaching the limit of what he could keep controlled, and that detail was enough to drive me to the edge too. He took his hand away from my mouth and grabbed my hair, yanking my head back as he fucked me faster, harder, driving his cock all the way in every time.

—Come. Come now —he said through clenched teeth—. Come for me, slut.

I came screaming into his hand when he covered my mouth again, my whole body shaking around his cock, my cunt tightening in spasms I couldn’t control. He held on for two, three more thrusts, then sank all the way in and came inside me with a deep growl, pinning me to the desk while his hot cum filled me in pulses I felt one by one. His fingers dug into my hips, his breathing finally uneven, finally human, semen dripping down my thighs when he finally pulled out.

I came a second later, with my cheek pressed to the cold desk of the fantasy and my eyes squeezed shut in the darkness of my real room, three fingers sunk into my cunt and my thumb pressing my clit until my legs shook and I soaked my hand and the sheets in one sharp gush.

***

I opened my eyes.

The ceiling of my room. Afternoon light filtering through the blinds. My legs were trembling and I still had two fingers inside me, soaked through. I lay still for a moment, catching my breath, feeling the sounds of the real world come back: traffic outside, the fan turning, my own heart beating faster than it should.

I slowly pulled my fingers out, brought them to my mouth without thinking too much about it, and sucked them, imagining it was him tasting me. I wiped the rest away on the edge of the sheet and stayed on my back, staring at the ceiling for a long while, with my cunt still throbbing and my panties a mess on the floor.

On Monday we had class with him again.

I couldn’t wait.