Heart-Pounding Fun Futanari Sex Ed Time
"Schlick schlick, I'll help you out by stroking it up and down," I said, and Mari hung her head. Her hair fell down, hiding her face, but I could see her ears turning bright red. Hmm, was I too blunt? This kind of silence between friends—especially girl friends.
"You've never even tried it by yourself, right?"
"Have you…?"
"Of course."
A ton, in my past life, but I couldn't say that out loud.
"…I've seen plenty in videos and comics. You know I never even had a boyfriend."
Thank goodness my friends already knew I was a bit more boyish than other girls. No matter how hard I tried to act like a 'proper girl,' some things just couldn't be helped. Still, I'd gotten used to this body after living in it for a while.
How much I suffered when my first period hit… Mari, Ga-hyun, and Yu-hyun had helped me out a ton back then. Turns out pads aren't just something you buy and slap on…
"B-but still…"
"And if you don't drain it, it's bad for your body. It's just a physiological thing—you can't fight biology."
"Yeah…but still…"
Kim Mari… this conversation's going nowhere… I grabbed her shoulders, still hesitating, and said,
"What's so embarrassing? We've been friends since we were kids."
"R-right."
"Friends can handle this much. Remember when I broke my leg?"
"Back in middle school?"
"You helped me with everything—toilet trips, changing clothes, all of it."
"Yeah, I did."
"It's the same thing. And we've already seen each other naked anyway."
I scratched my cheek and added,
"…Though I am kinda curious about something that huge."
"…Pfft, what the hell."
Mari burst out laughing, seeming a bit more relaxed. But seriously, no joke—that thing I saw earlier was definitely over 20cm. And it even had this thicker midsection, like a sturdy pillar.
In the comics, dicks like that are supposed to feel amazing…
Twenty years living as a girl after reincarnating. I couldn't stop thinking about my first experience with this body. No matter how used to being a woman I got, I couldn't imagine—didn't want to imagine—doing it with a guy.
Did becoming a girl make me like men? I'd worried about that before, but thankfully, my heart never raced around guys. If anything, I was still drawn to pretty girls with big tits, just like in my past life. Sure, they didn't have dicks, but you could just tell.
"Anyway, I'm not doing this because I hate it or anything, so don't worry about that."
"Really…?"
Mari glanced away, then squeezed her eyes shut with a hum and opened them again.
"Then… just a little… help me out… I'll do it myself next time…!"
"Can't we start tomorrow? I already… uh, came once—no, twice earlier."
"It said you have to do it several times a day."
I poked the already bulging front of her pants with my finger. Tap tap.
"Looks like this guy's all ready to go."
"Ow, I don't know, seriously!"
She stripped off her clothes one by one, and massive tits bounced free. Nipples fully erect—totally primed.
"D-do I really have to get fully naked?"
"Gotta see everything properly. You just came earlier without really looking."
"Hiiing, but it's so embarrassing."
"Still, it's your body now—you should get to know it."
"Ugh…"
"I'll strip too."
"R-really? Thanks…"
She finally got fully naked and sat beside me. I'd drawn the curtains just in case—not a high floor, someone might see.
"…"
Mari sat primly, hands on her thighs like she was super tense. She was trying to squeeze her legs together to hide it, but that massive dick wasn't hiding for shit.
"Guys sometimes don't get hard when they're nervous, or so I've heard."
"R-really?"
"Good thing it's standing tall."
"…!"
"Alright, I'll teach you step by step."
I sat behind her and gently placed my hand on her back. Already damp—nervous sweat?
"Eek!"
She flinched at my touch, body trembling. At the same time, the dick she'd been trying to hide sprang up proudly.
"See it clearly now?"
Hadn't even touched it yet, and precum was already dripping from the slit.
"Know what that stuff coming out of the tip is?"
"…Semen?"
"Nope. Semen's white and sticky. You saw it earlier."
"Th-then piss…?"
Embarrassed or turned on? Her breathing was picking up.
"…Did you sleep through sex ed?"
"N-no, but they didn't teach about male parts…"
"That's why I'm teaching you. Time to learn."
I carefully reached out and gripped her dick.
Warm—no, hot? So much blood rushing in—the skin was feverish, hotter than normal body temp.
"S-Seo-yoon?!"
"Look in the mirror, not at me."
I scooted closer, pressing my chest against her back. Better angle for teaching.
"Y-your boobs are touching mine!"
"I'm a girl too, so yeah, I've got tits."
"…!"
She whipped her head around like that wasn't what she meant, but it was just cute. Teasing her was addictive. But maybe not too much.
"That's precum—Cowper's fluid."
"Cowper's… fluid?"
"Yeah. You saw your semen earlier, right? Shot out with crazy force."
"Yeah…"
"But when you touched it, it was sticky, right?"
"…Huh? Oh, yeah…"
"Semen's a liquid, sure, but it doesn't pour out like water. Not like this."
I moved my fingers gently, softly stroking without hurting. Feather-light touches at the tip.
"Hngh♡"
Even that light stimulation made a big glob of precum surge out—she wasn't used to it yet.
Hmm, that slick texture. Feels like forever.
"Th-that's the Cowper's fluid…"
"Yup. Slippery, right? You felt it."
"Ah, so this comes… before the semen?"
"Exactly. See the slit at the tip?"
"Hah♡"
I tapped the urethral opening lightly.
"In guys, piss and semen come out the same hole. Us girls have separate ones."
"I-I knew that…"
"Yeah, you learned that part."
I gripped the shaft with my other hand.
Thicker than mine from my past life already…
"It rises from the base first, lubing up the urethra for semen—like lube."
"I-is that so."
"See where my hand is?"
"Yeah…"
"Those hanging below? That's your balls—the testes."
"…!"
"That's where your sperm and semen get made."
Smaller than right after she came earlier, thanks to that load. Still bigger than most guys', though.
"O-oh♡"
I caressed them gently with both hands, careful not to hurt. New sensation for her—she moaned. Surprised by the slutty sound from her own mouth, she clapped a hand over it, but couldn't stifle everything.
"When we first develop in the womb, these split to form our pussies."
"…!"
I lifted them softly, feeling the weight, revealing the hidden slit. Pink, just like her nipples—a straight line.
"Pussy's still there, as expected."
"Hnn, ha…♡"
"No need to explain this, right?"
She nodded.
"Back to the dick then. Gotta wash the balls well— all those wrinkles trap sweat and gunk."
"Ah…"
"Skip it 'cause it's a hassle or embarrassing… and it starts to smell."
"Gasp!"
"Hmm, you washed good earlier?"
"I scrubbed hard…"
"Good girl. Still, be careful?"
"Huh? Why?"
"Balls are wrapped in that sack, but inside, they're like internal organs."
"Like ovaries?"
"Exactly. Eggs are fine inside, but sperm hates heat. That's why they're outside."
"S-so guys walk around with their guts hanging out?!"
"Keeps 'em cool. Just don't bump or twist 'em. Connected by blood vessels—can tangle like earbud cords."
"…!"
Her face paled imagining it, nodding furiously. That covered the warnings…
Time to teach masturbation? I blew softly in her ear to loosen her up—she shivered.
"Wh-why, Seo-yoon…?"
Her thighs quivered faintly, anticipating what came next.
"You're all prepped."
"Huh?"
I slid my hand up the shaft and gripped her dick—not brushing lightly this time, but a firm hold.
"Now I'll show you how to jerk off with your dick."
"W-wait, let's take a break first!"
I grinned at her flailing protests.
"Nope."