A single mother with two young daughters would naturally not take on the burden of raising another child purely out of kindness. Caleb's parents paid Kasumi Takamine a monthly fostering fee that was more than enough to raise three children, with only one condition: that only Caleb be taken in.
When both options were cute little boys seeking foster care, the one who paid more got the deal. The adult world was that simple.
Caleb and the Takamine sisters had lived together for seven years. That extended time was enough for the Cuckold-Bait template to completely captivate the two sisters. Now, all that remained was to break through the final barrier.
While Caleb was engaging in behavior that was written as massage but read as fondling, the Sasaki house was also quite lively. The four girls were gathered around a small square table.
Yuki Shinohara recalled Caleb's earlier words and asked directly, "Reina-nee, how did Uesugi suddenly get so strong?"
"Well, Uesugi isn't actually an ordinary person…"
Reina Hamada repeated the excuse Caleb had used to fool them.
"Since Uesugi has a Succubus bloodline, why haven't you reported it?"
After listening, Yuki Shinohara was even more confused. Students in the supernatural faction were not few, but definitely not numerous. When a new member joined, everyone received a notification. If she had known Caleb was not an ordinary person, she definitely wouldn't have rushed in blindly, only to be effortlessly pinned down.
"Although reporting him would get us some resources, we value Uesugi more than those paltry resources."
"Uesugi? Does he have any other special traits besides the Succubus bloodline?"
Reina Hamada didn't answer directly, saying instead, "Yuki, try to sense your magic power carefully."
Yuki Shinohara didn't understand, but her body was obedient. As soon as her "boss" spoke, she complied.
"My magic power has increased by about one-fifth, but what does this have to do with Uesugi…"
Halfway through her sentence, she finally realized the significance. She hadn't extracted any magic power today, and even if she had actively cultivated, she couldn't possibly increase it this much in a single day.
"Uesugi actually has an ability like that…"
Yuki Shinohara was dazed, her face shifting between surprise and conflict.
"Yuki, don't overthink it. The first time has the best effect; the boosts will get smaller later."
Yukina Sasaki interrupted the now-fantasizing Yuki Shinohara. "We still have one doubt about this."
"What is it?" Yuki Shinohara looked puzzled.
"A Succubus naturally increasing her strength through fluid exchange isn't remarkable, but a Succubus being able to help her partner boost their strength… this is the first time we've heard of it."
"I remember you're a Half-Devil. Have you encountered anything like this?"
Reina and the others weren't devils; they were just humans who had awakened abilities. Because their strength was too low, they hadn't yet been exposed to other supernatural races in the hidden faction, like Devils or Fallen Angels.
"Succubi are a type of Devil, also known as Incubus/Succubus."
"There is absolutely no record of a Succubus being able to help the person they're absorbing life-force from increase their strength. It's considered restraint if they don't suck their partner dry."
Yuki Shinohara frowned, then added, "But things are different now. Over the years, various mixed-bloods have emerged, and I wouldn't dare say it's impossible."
"Are mixed-bloods common now?" Ruri Kurumizaka asked curiously. "Uesugi said he has a Succubus bloodline, but he didn't say he was a pure Succubus. Could he be a mixed-blood too?"
"Mixed-bloods are indeed very common, but powerful ones are rare."
As a Half-Devil, Yuki Shinohara had specifically researched this information.
"Human-Devil mixed-bloods, Human-Dragon mixed-bloods, Human-God mixed-bloods, Dragon-Devil mixed-bloods, Devil-Fallen Angel mixed-bloods… there have even been mixed-bloods possessing three or four bloodlines simultaneously."
Reina and the others were dumbfounded. "Can one person really possess three or even four bloodlines at once?"
Yuki Shinohara spread her hands innocently. "Don't ask me; I'm just a common Human-Devil mixed-blood."
"Then is there a way to test bloodlines?"
The more they learned, the more curious they became about Caleb's heritage.
Yuki Shinohara shook her head. "I don't know. Most people determine bloodlines by looking at the parents. No one bothers to research how to test bloodlines randomly."
"Caleb is fostered. His biological parents seem to be constantly overseas and haven't returned."
They had spent a lot of time with Caleb recently. Besides dual cultivation to increase strength, they also talked a lot. It wasn't always sex-at-first-sight, followed by a quick exit, especially with the occasional ceasefire. Through this interaction, Caleb had become a friend to them.
"You could try asking Rias Gremory, the 'Red-Haired Ruin Princess'."
Seeing the disappointment in Reina and the others, Yuki Shinohara suggested, "Rias is the head of the Occult Research Club. She is very kind to her juniors, and rumor has it she is a High-Class Devil. She might have a method."
"The Red-Haired Ruin Princess…"
Yukina Sasaki sighed. "Forget it, she's too far above us to approach. Instead of asking that princess for help, maybe we should ask Fuyuko Sakuramachi in the next class."
"Hmm, I remember Sakuramachi mentioning she was a Succubus, but I don't know how pure her bloodline is."
Yuki Shinohara looked exasperated. "While mixed-bloods are common, they haven't reached a saturation point. Even though everyone is humanoid, there are differences in aesthetics and habits."
That was true. Just Devils alone could be divided into several categories, and Succubi were one of the more representative types.
Reina Hamada ultimately decided. "Okay, after the test next week, we'll report Uesugi's situation. By then, his benefit to our strength will probably be minimal anyway."
"Then… will we still have sex with him afterward?" Yuki Shinohara hesitated.
Yukina Sasaki teased her. "What's wrong? One time and you're already conquered?"
"Of course not." Yuki Shinohara's face was bright red, and she stammered, "That guy is annoying, but compared to other men… I think Uesugi is a little better."
Although Yuki Shinohara's words contradicted themselves, Reina and the others understood.
"Yuki, you don't have to worry about us finding other men."
Reina Hamada rested her chin in her hand, sighing. "I don't know if it's the Succubus bloodline, but every time I have sex with Uesugi, I feel more attracted to him."
"+1."
"+1."
Yukina Sasaki and Ruri Kurumizaka followed suit, expressing that they felt the same way.
"Now, the thought of finding another man… I just can't get interested."
"Forget finding other men, now when I think about sex, Uesugi's face immediately pops into my head."
Men had asked them out during this time, but they constantly and unconsciously compared them to Caleb. This led to both psychological and physical rejection. They didn't even have the interest to talk much, let alone develop the relationship further.