Using a Mysterious Spellbook Ended Up Creating a Slave Harem - Chapter 29

 A Best Friend Sandwich with Erika and Iroha - Part 2

"Ah…… ♪ Phew……, haaa…… ♪"

I slowly draw my penis out from Erika, who is currently basking in the sheer bliss I just gifted her. Her vagina lets out a distinct twitch as if even the act of withdrawal provides a wave of pleasure, and my cock breaks free from her depths. With my dick still maintaining plenty of its hardness and dripping with her love juices, I walk over and push the door open. It's time to call in Iroha, who must be eagerly waiting for her turn.

"Iroha! Come here." 

"Y—Yes! I have been eagerly waiting, Master ♪"

Emerging from the living room, she is clad in the exact same style of bathrobe as Erika. It doesn't suit Iroha's petite, youthful body in the slightest, making her look exactly like a middle schooler trying entirely too hard to play dress-up. That being said, the way she approaches me with such a radiant, joyful expression is incredibly adorable. Wrapping my arm around the petite girl's shoulder, I lead her into the sex room and close the door behind us.

"Ngh…… ♪ I—Iroha……?" 

"Are you alright, Erika-chan?" 

"Mmm……, I'm still full of energy."

Having finally drifted back from the lingering afterglow of her climax, Erika pulls her upper body up with a slight air of heaviness. She aims a reassuring smile at a worried Iroha, actively demonstrating that she is perfectly fine.

"Alright, strip naked for me, Iroha." 

"Yes……"

She offers a shy bashful reply as her hands trace down to the belt of her bathrobe. Given that she never shows this kind of hesitation during our usual one-on-one trysts, it is safe to assume this modesty is entirely due to this being her very first threesome.

"Ngh……"

Undoing the knot of her belt, she takes her sweet time parting the panels of her bathrobe open. While her body is a sight I have grown thoroughly accustomed to by now, under these completely different circumstances, the sheer surge of my excitement is entirely unlike our usual encounters.

"Now then, first things first……"

Allowing her bathrobe to drop to the floor, I place the palm of my hand directly against the pristine, porcelain skin of Iroha's lower abdomen as she stands stark naked before me, channeling a burst of magic. The crest materializes in response, and I take a moment to compare its design directly with Erika's.

"Hmm…… Seeing them side-by-side like this, they really are quite different." 

"Yes. Compared to mine, Iroha's crest has a remarkably intricate pattern." 

"If you continue to regularly receive Master's seed inside you, Erika-chan, yours will eventually evolve into a similar state too."

Out of the five crest slaves currently under my possession, Iroha has been bred inside with the absolute largest volume of my semen. Granted, if Otoha Koujina falls into slavery, that dynamic might very well flip in the future.

"Next up is……"

Muttering to myself, I march over to the corner of the room and crack open the cardboard box. Pulling a black object from its depths, I present it directly before the two women waiting obediently for my command.

"This is……" 

"A strap-on, isn't it?" 

"Exactly. Except it's a bit different from the one Erika owns."

The one Erika had in her collection was a panty-style harness, whereas this model features a system of belts designed to secure the base of the dildo firmly around the hips and thighs. In other words, the woman wearing this piece leaves her own pussy completely exposed, allowing for simultaneous penetration. The dildos themselves are entirely interchangeable, coming in a set of three sizes: small, medium, and large. At the moment, the medium-sized piece is locked into place, and I decide to have Erika strap it on exactly as it is.

"Alright, Erika, put this on." 

"Understood. So I am to pierce Iroha with this, correct?" 

"And while she does that, Master will be entering inside Erika-chan, right?" 

"Bingo."

While Erika busies herself fastening the strap-on, Iroha moves over to the mattress closer to the door and lies flat on her back. Once Erika finishes equipping the harness, I hand her a bottle of one-hundred percent organic, completely body-safe lubricant, and she begins slathering it over the black dildo. The visual of her using both hands to smoothly rub lubricant up and down the skyward-pointing rod nestled at her groin is incredibly lewd. The moment Erika completes her preparations and moves in to take her position, a reclining Iroha obligingly spreads both of her legs wide.

"Hehe ♪ You're so cute, Iroha ♪" 

"Please be gentle with me, Erika-chan……"

Thanks to the passive effects of her crest, Iroha's genitals are already glistening with an abundance of natural lubrication. Watching that gleaming black dildo slowly sink inch by inch into her small, lovely vaginal opening is a sight that sends my arousal skyrocketing.

"Ngh! Ah…… ♪" 

"How does it feel, Iroha?"

Connecting with Iroha in the missionary position, Erika drives the shaft all the way home for an initial deep stroke. Maintaining that posture, she hooks both hands under Iroha's legs, lifting them high to practically pin the petite girl's frame beneath her weight.

"Please, Master ♪ Insert yourself inside my opening ♪" 

"Ah, yeah, got it."

Dropping to my knees directly before the locked groins of the two stacked women, I prepare myself. After verifying that Iroha's pussy is firmly clamping around the dildo, I guide my slick, throbbing shaft with my hand and slide right back inside Erika's core.

"Ahhh…… Master's feels so massive ♪" 

"This is…… Honestly, this feels even better than before."

Perhaps due to Iroha's active participation, the interior of Erika's vagina feels spectacularly tighter and sweeter than usual. While I pause for a brief moment to savor the intense friction, Erika begins pumping her hips right between the two of us.

"Ah ♪ Yes! Hngh ♪" 

"E—Erika-chan ♪ Ahh ♪"

As Erika forces her hips to move within the cramped space, I grasp her waist and begin hammering deep into her core. Though our rhythm is a bit clumsy and uncoordinated at first, after a few synchronized thrusts, the movements of all three of us lock into a seamless, unified cadence.

"Ngh! Sandwiched between M—Master and ngh ♪ Iroha…… it feels so incredibly good! ♪" 

"Hii! Right there, n—no! That's too much! ♪" 

"Ohhh…… Erika's interior is clamping down like crazy."

Even more so than during our one-on-one sessions, Erika's vaginal walls are squeezing and wrapping around my shaft with an unbelievable degree of suction. Keeping both of my palms planted firmly on the mattress to avoid crushing Erika with my weight, I reach around her torso and roughly knead her dangling, heavy breasts.

"Ahhh! P—Please, massage my tits even harder! ♪" 

"Ahn~ ♪ It feels like I'm being held by M—Master and Erika-chan at the exact same time ♪" 

"H—Having sex with three people offers a completely unique kind of bliss……"

The wet moans and ragged breathing of the two women fill the entire room, caressing my ears in a symphony of lust. As the three of us tangle together, working up a light sheen of sweat, Erika is the first to approach her absolute limit.

"I—I'm going to! Master~ ♪" 

"Hngh ♪ Nooo~ ♪ I haven't reached my climax yet ♪" 

"H—Hold it back a little longer, Erika." 

"Y—Yes~ ♪"

As I drive my hips forward in an effort to bring Iroha to her peak as well, the intense friction against my rod only forces Erika's pleasure to compound even faster.

"I—I can't take it anymore! I'm going to cum! ♪" 

"M—Me too, I feel like I'm about to go any second ♪" 

"I'm close too, just a little more……"

Iroha's slender legs have wrapped themselves tightly around Erika's fleshy thighs. Moving into the final stretch, I accelerate the pace, violently hammering my hips forward.

"N—No! I'm going! I'm cumming!!" 

"Me too, I—I'm about to go!!" 

"I—I'm going to blow too! Let's all go together!" 

"I'm c—cumming!! Ohhh!!! ❤️Haaahhh!!! ❤️" 

"It's so good!! Ahhh!! ❤️Ahhh!!! ❤️" 

"Ohhh!! It's coming!! Ngh! Damn it……"

Following right on the heels of Erika, who collapses into a helpless, body-shaking climax, Iroha lets out a high-pitched cry of pure ecstasy. Caught in the crushing, violent contractions of Erika's newly climaxed vaginal walls, I can no longer hold back and unleash a massive second round deep within her absolute innermost depths.

Basked in the paralyzing euphoria of our mutual climaxes, all three of our bodies freeze completely in place. Being the man, I am the first to recover from the afterglow, smoothly sliding my mucus-coated shaft out from Erika's interior. Iroha returns to her senses shortly after, but with Erika's heavy frame completely slumped over her, she appears utterly pinned down.

"E—Erika-chan…… you're s—so heavy~" 

"Ngh………… ♪ Haa………… ♪" 

"M—Master~" 

"……Hang on a second."

Responding to Iroha's plea, I scoop up Erika's voluptuous body to separate the two of them. The pulled-out dildo is heavily coated in Iroha's thick love juices.

"Hauu…… Master, would it be alright if Erika-chan and I switched places next?" 

"Switch?" 

"Yes. This time, I want to…… wear the strap-on."

It appears Iroha is preparing to launch her counterattack. This is a visual I am more than eager to witness. To facilitate the swap between offense and defense, I unfasten the strap-on from Erika, who is still thoroughly dazed in a pool of pleasure. Glimpsing the dildo attachment, a fun idea strikes me before I hand the apparatus over to Iroha.

"If we stick with this size, it might not be enough to truly satisfy Erika." 

"In that case, let's swap it out for the absolute largest one."

I dismantle the current medium-sized attachment and click the extra-large dildo into place. Handing the gear over to Iroha, she straps it on with ease—likely having observed exactly how Erika wore it moments prior—and immediately begins smoothly coating the giant rod with lubricant. In the meantime, I take a moment to thoroughly wipe away the fluids coating the medium dildo I just removed. While I'm at it, I quickly clean up the excess bodily fluids Erika left behind on the further mattress. Tossing the used tissues into the trash can, we dive straight into round three.

I shift a completely drained Erika over to the further mattress, laying her flat on her back. Turning my gaze to Iroha, she offers a knowing nod, mirroring the exact missionary stance Erika had assumed earlier.

"It's my turn this time, you know? Erika-chan ♪" 

"Nnngh…… I—Iroha……?"

Iroha begins sliding the massive black dildo—a size that looks utterly ridiculous attached to her petite frame—deep into Erika's pussy. Thanks to our previous rounds, her opening is spectacularly lubed, allowing the massive shaft to be swallowed effortlessly all the way to the root.

"Nnngh! Ahhh…… Iroha…… to think the two of us would ever end up in a relationship like this ♪" 

"B—Being the one doing the piercing feels incredibly strange ♪" 

"I love you so much, Iroha!" 

"M—Me too…… Now then, Master ♪ Please give it to me as well ♪"

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