"Big sister, it's time for you to fulfill your promise," Lucas said.
Sarah trembled, her reddened eyes instantly welling up with tears.
"Master, please, I beg you, don't hurt Celes, okay?" Overcome with guilt at the critical moment, Sarah couldn't bring herself to lay a hand on Celes Wester.
"I'm willing to be master's little bitch for the rest of my life, to bear master beautiful daughters, to bring all the beauties in the world to offer to master. I only ask that master spare Celes, okay?"
"These are things you should already be doing as a sex slave," Lucas replied, somewhat moved but not yet willing to agree. "If you want me to agree, at least give me a better reason. Why should I say yes?"
"...Because..." Sarah suddenly seemed to realize something, as if struck by inspiration.
"Because you like me! You said it before, that you like me, right? As long as you're willing to spare Celes, I... I'll try my best to like you too..."
Like? Lucas never expected Sarah to bring up this word at such a moment.
Lucas had indeed said things like "I like you" before, but as Sarah had pointed out at the time, it was nothing more than lust at first sight. Where was the genuine affection?
However, Sarah's offer to "try to like him" stirred a flicker of joy in Lucas's heart.
He didn't particularly care whether his sex slave liked him or not, but he saw this as an opportunity to further train Sarah.
The art of training lay not just in breaking the body, but in conquering the heart.
Over these past days, Sarah's body had long since submitted, but her heart was far from surrender.
Even during their couplings, Sarah deliberately avoided any intimate gestures reminiscent of lovers, making Lucas feel that the path to complete submission was still long.
Now that Sarah had finally broached the topic herself, Lucas couldn't let this chance slip away.
"Since big sister has said so, I suppose I have no choice but to agree this once," Lucas feigned a look of deep affection.
"Really?" Sarah could hardly believe it.
"Of course!" Lucas declared firmly. "As long as you don't agree, I won't lay a finger on Celes!"
And I'll naturally find a way to make you agree—this last part Lucas kept to himself for now.
"Thank you, master!" Sarah smiled in relief. It was the first time in all these days that Lucas had seen the ice beauty smile. Though fleeting, it added a touch of radiance to her already flawless, cold jade-like face.
Lucas walked to Celes's side and, right in front of Sarah, pricked the long-legged girl's fingertip with a needle to draw a drop of blood, then used the System to form a blood contract.
"Congratulations, host. You have formed a blood contract with a third-tier Wizard. Reward: 300 points."
"Master!" Sarah thought Lucas had gone back on his word and hurriedly grabbed his wrist. "How can you break your promise..."
"Who said I broke my promise?" Lucas replied. "I only took her blood. I didn't fuck her. Why are you panicking?"
"If master isn't... isn't going to fuck her, then why take Celes's blood?"
"The cultivation technique I practice requires the blood of other Wizards to strengthen myself," Lucas explained, half-truthfully. "Since you call it a demonic technique, of course it involves demonic methods."
Sarah was naturally skeptical, but for now, she could only play along. She pressed herself against Lucas, took his hand, and guided it under her skirt, adopting a sweet, coquettish tone she had never used before.
"Then congratulations on master's progress in cultivation. Does master want to 'celebrate' with his little bitch's slutty pussy?" Lucas knew full well that Sarah was trying to drain him to prevent him from turning his attention to Celes.
He didn't call her out. Instead, he slid the hand she had pulled under her skirt into her panties, reaching back to her asshole. His finger circled the rim, making Sarah shiver slightly.
"No, I'm a bit tired of fucking big sister's slutty pussy," Lucas said with a smirk. "Today, I want to fuck big sister's slutty asshole."
Though Sarah had read about anal sex in the sex slave manual and had long been mentally preparing for it, when the moment finally arrived, fear still gripped her.
But remembering that Celes was lying unconscious right behind her, Sarah could only steel herself.
"...My... my little bitch's slutty asshole has been wanting master's cock for so long," Sarah struggled to maintain her composure, wriggling her hips to press her asshole closer to Lucas's finger.
"My little bitch's slutty asshole is so itchy, it really wants master's big dick inside."
"Good, big sister is getting sluttier by the day," Lucas said approvingly, giving Sarah's ass a hard slap. "Climb onto the bed and stick your ass up."
Sarah bit her lip, finally steeling herself. With graceful movements, she stripped off all her clothes, climbed onto the bed, and knelt with her ass raised high, exposing her tiny, pink asshole.
Lucas hastily stripped off his own clothes and approached the bed. He lightly prodded the trembling beauty's rear entrance with his knuckle while rubbing his half-hard cock against Sarah's labia.
Over the past days, Lucas had ejaculated once or twice daily inside Sarah. Today, he had already cum three times just that morning.
Though the sight before him was obscenely enticing, his cock refused to harden fully.
Fortunately, he now had new points to spend. He opened the System store and spent 100 points to exchange for a new ability.
[Peak Condition (Beginner)] After obtaining this ability, the reproductive system can be restored to full vitality once per day.
Instantly, vigor flooded back into Lucas's lower body. His cock swelled rapidly, the thick, hard glans pressing against Sarah's clit and drawing a moan from the ice beauty, her pussy gushing with juices.
"...Ah... master's cock is so hard... so hot~"
Sarah began moaning loudly, her words dripping with temptation, all aimed at luring Lucas into fucking her pussy instead of her asshole.
Lucas wasn't fooled. He slapped Sarah's ass hard and growled, "Behave!" Then he reopened the System store and spent 10 points to exchange for a Cleansing Pill.
[Cleansing Pill] Ensures the recipient's rear remains forever clean.
Prying Sarah's buttocks apart with both hands, he fully exposed her asshole to the air before inserting the Cleansing Pill. The pill dissolved visibly upon contact with her rear.
Lucas leaned in close and sniffed. Instead of any foul odor, he detected a faint, fresh fragrance.