Once everyone had left, the entire room was engulfed in darkness, as if swallowed by a void.
"Huh?" Rias grew even more confused by what was happening.
While she was still trying to make sense of the situation, tentacles made of darkness suddenly emerged from the surrounding and bound her tightly.
Realizing what was happening, she turned toward Ren with an angry glare.
"Ren, what is the meaning of this?!" Rias demanded firmly as she struggled to break free.
I said nothing and simply walked toward her.
After arriving in front of Rias, I touched her head and immediately activated the Demon Mark.
Unlike with ordinary humans, it seems I need a lot more MP when using the Demon Mark on supernatural beings, and I also have to make direct contact with the target. I learned this from trying it on Koneko yesterday.
Fortunately, thanks to Mana Concealment, Koneko didn't notice anything at all.
Mana Concealment is more useful than I expected—it can hide the mana that leaves my body, allowing me to use as much mana as I want without anyone noticing.
As I poured mana into Rias, her struggle to break free intensified. She began using her Power of Destruction to break her restraints, though it was a slow process.
Realizing that the restraints were stronger than she expected, she started questioning Ren's actions.
"Seriously, Ren, what are you doing? You're just touching my head without doing anything," said Rias, her tone calming slightly because Ren wasn't actually doing anything harmful.
"I'll tell you after I'm done," said Ren, which made Rias a little dissatisfied, but she could only wait.
After a while, I finally finished, gasping slightly for air—because attaching the Demon Mark to Rias had taken three-quarters of my MP in my normal form.
As I released Rias from her restraints and sat beside her, she crossed her arms under her chest and looked at me with a frown.
"Now, explain to me what you're doing," Rias said firmly, a hint of confusion in her voice at Ren's behavior.
"I am enslaving you," I replied curtly.
"Huh?" she responded, even more confused, tilting her head in a cute manner.
"Stroke my cock" I ordered to prove to her that I could control her.
"What are you-" Rias began to say but stopped because her body was doing what Ren said.
Her eyes widened as she couldn't believe what she was doing. She tried to resist, but it was useless—she kept stroking Ren penis through his pants.
At the same time, she cannot help but blush. Because this is her first time touching a man penis though not directly, and it's bigger than her though.
But then she sighed in resignation as she looked toward Ren.
"It seems you've really enslaved me," Rias said, a bit depressed about her situation.
"Don't be sad. It's not like there aren't any benefits to this," I said, wrapping my arm around Rias's shoulder and pulling her closer.
"There are?" Rias asked, a little curious, as she caught the scent of Ren's body, which made her want to smell it more.
"Well, you see, I have a power that lets me grow stronger by absorbing corpses. That's also why I decided to enslave you—I need resources to increase my strength," I said while gently stroking Rias's head.
Rias was a bit surprised by his ability, but the way Ren stroked her head made her feel good.
As she looked at his handsome face, she thought maybe being enslaved by him wasn't so bad.
"And by enslaving you, I can make you stronger too—by channeling my mana through our connection," I explained further.
Since my Demon Mark has been upgraded to level five, I can now empower others instead of just controlling them.
Hearing that made Rias happy, as defeating Riser now seemed easier. But then she puffed her cheeks in a pout as a thought came to her.
"But… couldn't you have just asked nicely? There was no need to restrain me, right?" Rias said, a bit dissatisfied, as she had really thought Ren was about to do something bad.
"Well, most people wouldn't agree to being enslaved," I replied.
"I guess that makes sense," Rias answered after thinking it over.
"Also can you make me stop?" Rias said blushing because she was still stroking Ren penis.
I just smirked hearing that and immediately opened my pants.
Seeing the anaconda coming out of Ren's pants made Rias's eyes widen, feeling a little scared and fascinated seeing its large size.
"Now I'm a little horny when I see your sexy body, make me cum with your hands" I ordered Rias while squeezing her supple chest.
Rias could only obey and stroke Ren's penis while breathing hard because she felt pleasure when her chest was squeezed.
While Rias was stroking my penis clumsily, I just looked at her with amusement, feeling ironic because the price for freedom from her engagement was to become my slave.
Then I guided Rias to be more skilled. I also told her to use her saliva to make it easier.
And with that time passed and Rias stroking became faster which made me close to cumming.
When I am about to cum I tell Rias to use her mouth on my penis so my seed doesn't squirt everywhere.
"Ugh, I'm cumming!" I groan in pleasure as I cum my seed in Rias's mouth.
Rias, who covered Ren's penis with her mouth, widened her eyes in shock because Ren's seed kept coming out which made her cheeks swell because it didn't fit.
When she was about to vomit it, she felt Ren's command to swallow all of it. She had no choice but to swallow it all.
Plop
Rias's voice after she finished swallowing all of Ren's seed and released her mouth from his penis.
"Good girl, you're doing a good job," I said, stroking Rias's head with a grin.
Rias just glared at Ren, her face flushed—whether from embarrassment or anger, only she knew.
"From now on, call me 'Master' when we're alone," I said with a smirk.
"Yes, Master," Rias replied, resigned to her fate.
"Also, bring me as many corpses of high-ranking ones or higher as you can tomorrow," I ordered.
Rias simply nodded in response.
"Alright, I'm heading out now," I said, then walked out of the Occult Research Club room feeling satisfied.
Rias watched Ren leave with a sigh, still unable to believe something like this had happened to her.
She then pushed aside her negative thoughts and tried to think positively.
If what Ren said was true—that he could grow stronger by absorbing corpses and could make her stronger by transferring his mana—then she wouldn't need to worry about her engagement, as long as Ren continued to grow more powerful.
With that thought, Rias felt a bit more at ease about her situation, and she realized she preferred being with Ren rather than Riser—causing her to blush, unaware that she was being affected by Ren's Temptation skill.
As she was still deep in thought, her peerage members returned, entered the room, and approached her.
"So what are you two talking about? Did you do something lewd while we were gone?" Akeno said as she sat beside Rias and smiled teasingly.
Rias comes back from her though when she hears Akeno's voice.
"No we are not," said Rias a bit panicked, trying to maintain her composure.
"I see that disappointing, so did he agree to become your peerage?" Akeno said while still smiling.
Just when Rias was about to answer Akeno, Koneko said something that surprised her.
"Rias, you smell strange," Koneko said, sniffing the air. For some reason, the scent made her fidget slightly.
Rias suddenly stood up the moment she heard Koneko's comment, her face flushed red.
"There's something I need to do. I'll be going now," she said, quickly walking away with slightly hurried steps.
There's no way… right? Akeno thought, watching Rias leave with a hint of suspicion.
Meanwhile, Ren returned to his classroom, and coincidentally, the bell rang at that moment.
Since he had just done it with Rias, he was still in "sage mode," so he didn't do anything to Aika and simply used her as a lap pillow in the back of the class.
"Wake me up when class is over," I said as I closed my eyes.
Seeing Ren fast asleep on her lap made Aika grit her teeth in irritation as he did whatever he wanted with her.
Well I guess this is not too bad, Aika thought as she watched Ren sleeping face which she thought was cute.
Then feeling naughty and a bit of revenge, she uses her hand to feel Ren's body.
Thirty minutes later.
I slowly wake up as I feel a hand stroking my lower body.
When I open my eyes I see Aika's face grinning at me from above.
"Good morning," she said as she continued stroking my penis.
"Hmm, I see you're diligently performing your duties as a slave," I said, lazily stroking her smooth thigh.
At my words, Aika's grin wavered, but she kept going.
"Yes, yes, I'm your slave, Master," she replied while rolling her eyes, a bit displeased, as I felt sarcasm in her voice when she said master.
"Yes, keep calling me that from now on," I said with a grin.
As I enjoy the Aika hand, I suddenly remember something and try to use it on Aika.
While Aika is focusing on making Ren cum, she suddenly shivers in pleasure as she feels something slimy touching her pussy.
When she looked down she immediately opened her eyes wide, feeling surprised because Ren's tongue had lengthened and entered her panties.
She then bit her lip feeling pleasure when Ren's tongue played her clitoris.
Feeling challenged, she tried harder to make Ren cum first.
Sensing Aika's faster hands, I glanced at her face and seeing the competitive light in her eyes made me realize what was on her mind.
Challenge accepted, I thought with a smirk as I used my lengthened tongue to enter her pussy licking her wall searching for her weakness.
Feeling Ren tongue pleasuring her pussy, feels different then masturbating by herself which makes her emit a moan of pleasure.
Can't be out done she began using her mouth and using her other hand pleasuring Ren ball, even though she never did this, at very least she knew how to do it, based on porn she watched.
Seeing Aika in an awkward position, I then lifted my head and held her butt and put it in front of my face making a sixty nine position.
I then slid her panties and ate her wet pussy greedily and put my tongue back into her pussy.
Slurp slurp slurp
The sound of Aika doing a blowjob by moving her head up and down, which I admit that she has talent because her blowjob is more enjoyable than before.
While I explored her pussy, I already knew some of her weak points based on the reactions I got from her body.
I then attacked her weak point relentlessly which made her cute ass wiggle around, which made me squeeze it and feel its soft texture.
Aika who felt her orgasm was coming became desperate and tried to deep throat which made her gag because she was not used to Ren's big size.
She can't help but abandon her idea and try harder to make Ren cum.
I, who felt Aika's orgasm was near, started to use my hand to pinch her clitoris, which made Aika let out a muffled scream and squirt her cum on my face.
I also felt my climax was near which made me unable to hold back and immediately put both my legs on Aika's head and lowered her onto my penis forcefully.
Aika immediately let out tears in the corner of her eyes because she felt tight and painful in her bulging throat and immediately tapped Ren's thigh repeatedly to tell him to stop.
I just ignored Aika and immediately held her hips to keep her from running away, even though I could make her calm down with Demon Mark, it's more fun to watch her struggling to break free.
I then cummed straight into Aika's stomach while grunting in pleasure.
I am always amazed how much I can cum, as I am still releasing a lot. I even feel Aika's stomach bulging a bit.
After a while I finally let go of Aika, which immediately made her release her mouth from my cock.
"Pwaa! I thought, I'm gonna die" said Aika in a hoarse voice while rubbing her throat.
"Master, you are so mean, if you want a deep throat at least after I'm getting used to it" she said feeling helpless.
"Yes, I'm sorry about that, let me heal you for a bit," I said, feeling a bit bad seeing her tear while transferring a bit of mana to her.
Feeling her throat heal, Aika let out a relieved sigh.
I then sat down, leaning against the wall, and placed Aika on my lap.
"You probably have a few questions. I'll try my best to answer them," I said, since there was still time before class ended.
After that, we talked about supernatural things, which left Aika surprised to learn that such things actually existed in the real world.
But then again, she had already seen Ren's power to manipulate people to do his bidding, so she wasn't all that surprised.
I also told her that the members of the Occult Research Club and the student council were part of the devil race.
After hearing all of that, Aika sighed heavily and leaned against Ren's chest, feeling tired.
"This world is more dangerous than I thought," Aika said.
"You don't need to worry. With my connection to you, I can protect you anytime." I said with confidence.
Hearing that, a small smile appeared on Aika's lips, which made her feel relieved.