Although this side effect can be resolved by the hands of Cyrus after a woman cultivates the technique past the mortal realm under him. But before that, one needs to be very careful.
As for why this accrued, it was by overdrawing the Yin essence. A mortal woman didn't have a large Yin reserve, and they needed to rest to recover them. Although the DST can make those reserves larger, Cyrus's old godly self never really carved the yin of a mortal before.
But the current Cyrus was different, and he was like a bottomless pit for LXP, so he was now worried that this side effect might occur in Rita if he drew so much Yin from her on a regular basis.
Furthermore, DST was designed such that the woman won't even know they were walking on a deadly path, and without Cyrus, they were doomed to fail.
Every creator creates their techniques this way to have complete control over them and also to protect their techniques from falling into the hands of others.
Although the chances of it happening were almost zero, he didn't want to take a risk with her. So, he decided only to harvest her yin fully after she broke through into a new stage.
Besides, as long as he finds new women, he doesn't have to worry about overdrawing Rita at all, and as she grows stronger, this problem would also vanish entirely with Cyrus's help.
Cyrus no longer has doubts about her loyalty.
It's not like he didn't trust anyone, it's just that he hardly trusts anyone, and once he does, he would do it with his heart, especially the women he chose for himself.
Rita, who was finally able to catch her breath, looked at Cyrus and said lustfully, "Cyrus, let's do it again!"
Cyrus couldn't help but look at her blushing figure and smiled as he moved his hand over her head.
Rita thought he was going to take her, and her eyes shone with mirth, but the next moment, his hand shone in gently blue light before a wave of water manifested and washed over Rita's body.
The water was extremely icy and made Rita yelp in alarm, "What are you doing?" She quickly looked at Cyrus with disbelief while soaking wet.
Cyrus amusingly said, "Clearing you up, of course. You still have quite a lot of yang in you. Don't be greedy. You won't feel lust for a week or two at least."
He then flipped his bluish finger, and this time a massive blob of water appeared over them and fell on them.
"You bully!" Rita instantly yelled in resentment as she was utterly helpless as that blob of water, even colder than before, fell above them.
Cyrus ignored her as he enjoyed the 'shower' and felt refreshed. He then snapped his figures again, and the tips of his finger were surrounded by a red and white sheen. The very next moment, a warm breeze started to stir around them and quickly dry them.
"S-so magical!" Rita was dumbfounded by Cyrus's use of Qi as she felt giddy in that warm wind that was drying the water.
Cyrus chuckled as he said, "This is the beginning!"
Before tri-color Qi suddenly gushed out from his hand and shot toward Rita, and before she could react, she was already enveloped by it.
The next moment, Rita felt the gentle Qi wrapping around her body, and the next moment the tri-color Qi vanished, leaving Rita dumbfounded.
Because she was now clad in beautiful white and blue robes tightly wrapping her voluptuous figure, completely exhibiting her appealing charm, she looked like a sexy fairy with deep cleavage, showing half of her milky white ample breasts.
Before she could comprehend what just happened, Cyrus was also enveloped by tri-color Qi and the next moment. He was clad in royal blue robes looking like an immortal.
"This is a small trick that can be used by mastering Yin and Yang. These clothes won't be damaged by mortals, at least. I'll make treasure cloths after we find some materials." Cyrus chuckled as he was finally feeling more comfortable in the clothes he was used to.
Rita was utterly stunned by this revelation as she looked at Cyrus in worship. She was feeling quite comfortable in those clothes, and she knew they were far from ordinary.
Rita couldn't help but asked in a daze, "A-are you really a God?"
Although Rita revealed his background jokingly sometimes, it was simply too hard to believe that a God could turn into a mortal.
However, as time passed, Rita started to believe him, and now it was evident after she saw him using Qi to create these clothes out of thin air.
Cyrus chuckled and replied mysteriously, "In the past, yes. But right now, not yet."
Suddenly his expression turned stern, "Alright, enough daydreaming. I can feel that your cultivation is circulating on its own. Do you notice the change?"
Rita was startled by this sudden question and finally noticed that the yang essence in her body was getting absorbed on its own, and like last time, she didn't fall into a cultivation state at all.
Furthermore, her cultivation was slowly rising with every passing second toward the middle stage of the Foundation Building Realm. There were four stages of the Foundation Building Realm, Early, Middle, High, and Peak. And she just broke into the early stage and already heading toward the middle stage.
"Is this normal?" She asked Cyrus with uncertainty.
Before, she was so indulged in luscious pleasure that she didn't notice it and just wanted to experience it endlessly despite the fact that she felt exhausted. However, now her mind was clear, and the lust was nowhere to be found.
Cyrus replied, "It's another of the Devil's Spouse Technique, Infinite Pleasure. However, this ability has no use in actual life. All this ability is capable of is activating and keeping your technique activated as long as you have yang essence in you.
"Meaning you will be able to enjoy the feeling of sex without being worried about activating your technique on your own. As your power increases, this ability will become even stronger!"