The day after Issei and Kiyohime officially became a couple he decided to find the next person of the trio, Raikou. She had come back with him the day before when he revisited Chaldea and was taking care of some business she had with Kintoki. Issei was wandering the halls looking for Raikou, when he heard a conversation from around the next corner. "You did what with Master?!" said Raikou, surprised.

"Is it so surprising? Master has finally accepted my love, so it's only natural that we do such things," said Kiyohime, pride clear in her voice.

"Gnnnn… Such immoral acts are unacceptable!" said Raikou, going into her protective mother mode.

Kiyohime just shook her head before covering her mouth with her fan. "Tsk tsk, you'll never get Master's love if you continue like this. How do you expect to progress your relationship if you're so strict with him?" asked Kiyohime in a pitying tone.

"But, as his mother I have to protect him from all immorality," Raikou tried to deflect.

"You were only his mother as long as he lost his memory. Now that he's back with his real family he has his real mother back," said Kiyohime. Raikou visibly wilted at that, looking like she had lost everything. Kiyohime continued. "But this is a good thing. Now that the role of mother has been filled by his true mother, that means you can take a new position at his side."

Raikou looked at Kiyohime, teary eyed but confused. "A new role?"

"As one of his lovers," she said, hiding her smile behind her fan as Raikou made a surprised expression. Before Raikou could interrupt, Kiyohime continued. "We both know that you were a part of our group because we all shared the same feelings for Master. You've been hiding behind your role as his surrogate mother so that you wouldn't have to confront your true feelings for him. If you stay this way, Master will get farther and farther away as his group of women grow. If you wish to remain close to him it's in your best interest to do so now, while there's less competition for his attention."

"But, would he even accept someone like me?" she asked sadly.

Issei who was listening from around the corner, along with Kiyohime facepalmed at Raikou's question. "Raikou… You're not serious, are you?" asked Kiyohime. Raikou made a confused expression, as if not understanding why Kiyohime was asking that. Kiyohime sighed. "Raikou, what kind of women is Master interested in? Surely you know his preferences, since they were spread once Master regained his memories." Raikou sat in thought for a moment before realization dawned on her. Then she looked down at her own body, as if to make sure she matched the description. Kiyohime was annoyed by this but saw Issei peeking from around the corner.

He mouthed quietly to her so as to not make Raikou suspicious. "Thanks for your help, Kiyohime. I promise to reward you later."

That immediately improved Kiyohime's mood and she closed her fan loudly, getting Raikou's attention again. "Now then, stop wasting time. How long do you plan on making Master wait for you?"

"Wait for me? You think Master is waiting for me?" asked Raikou, still a bit unsure.

"Well, why don't you ask him yourself?" responded Kiyohime with a smile. Raikou was confused but saw her gaze and turned around. At some point Issei had come from around the corner and was standing behind her with a small smile on his face. Raikou was now stunned silent with embarrassment. "I'll leave you two alone," said Kiyohime as she turned and left.

Raikou's face was red and looking down while Issei just continued to look at her kindly. "Can you come to my room Mama Raikou?"

"Y-yes…" she managed to get out. She then followed him to his room.

The pair made it to Issei's room and were now facing each other. Raikou was still avoiding eye contact with Issei while Issei was just smiling at her. After a few moments of silence Issei finally spoke. "So, what were you and Kiyohime talking about?" he asked, pretending he wasn't eavesdropping earlier.

Raikou was reflexively about to respond with nothing, but she remembered Kiyohime's words earlier and stopped herself. She finally met his gaze. "How much did you hear?" she asked. Issei didn't respond, but his smile grew wider, which was all the answer she needed to start blushing again. "I'm unworthy as a mother. I shouldn't have feelings for someone who I considered my child."

Issei grabbed her arms, surprising her. "Raikou. I've never been disappointed with you. It's the other way around. I'm grateful to you, for everything you've done for me." Issei began to reminisce about his time in Chaldea before he regained his memory. "When I didn't know who I was, or where I came from, Chaldea became a home for me. Not only that, but the people who were here became my new family. They all filled different parts of my heart and made me feel like this place was my home, and you, gave me a feeling I had missed for a long time, even if I didn't know it at the time. That was the feeling of having a mother," he said while looking at Raikou warmly.

Raikou's face was still a bit red, but she smiled warmly at Issei. "Yes, I remember. When you summoned me, you looked so lost and you had such a huge responsibility on your shoulders. I couldn't help but want to take care of you."

Issei nodded, accepting Raikou's reasoning. "I will always be thankful for what you did for me, but now that I've returned home things have become a bit different."

Raikou's expression became sad. "I know. You've returned to your true family. To your real mother. She is a kind and gentle woman, unlike me."

Issei raised an eyebrow. "What do you mean, "unlike you"? You are both those things and more. That aside, it's not like there can only be one position of mother, but I want something different with you." Raikou looked at Issei, her expression searching as she didn't want to assume she knew what he meant. Issei took a breath and continued. "I'm sure you heard about me and Kiyohime." Raikou nodded. "Well, this might be a bit selfish of me, I wanted to close something I'd been putting off for a long time. The feelings of the girls who were attracted to me." Raikou blushed at his words. "Since I decided that I wanted to pursue my dream, I've decided to confront you all directly. It would be unfair to keep stringing you all along when we could simply be together."

"You say it like it's already a foregone conclusion," said Raikou, looking away again.

"If you have feelings for me, then isn't it so? After all, I love Raikou too, both as a mom and a woman," Issei said with a smile, knowing how dangerous his words sounded to anyone who could have been listening in.

"S-such an indecent relationship! It goes against the morals of society!" Raikou began to ramble as her face became redder.

"What does society have to do with our feelings for each other?" Issei said while closing the distance between them. Raikou's body leaned back as if wanting to escape, but she didn't take a step. Issei gave a knowing smile and grabbed her hand. "What others think are irrelevant to me. All that matters is if you have feelings for me. If you don't then I won't push it any further, but if you do then I promise to make you happy."

"But… are you truly fine with someone like me?"

Issei gave her a look that could only be described as him asking "really?", which caused Raikou to look away in embarrassment. So Issei decided to do something bold to try to erase her doubts. He reached up and grabbed her right breast which caused Raikou to look at where Issei was grabbing in silent shock. Her brain hadn't fully processed what was happening before Issei started messaging it, causing her to let out a moan. She quickly covered her mouth from the accidental slip and looked at Issei who had a mischievous smile on his face. "Do you believe me now?"

Raikou managed to regain some control of her emotions, despite Issei not stopping his action. "T-This is h-highly indecent!"

Issei raised an eyebrow at that. "Oh? Well, how about I show you something even more indecent?" he said mischeviously. He let go of her breast finally, which she let out a breath of relief, which didn't last as Issei picked her up and carefully threw her onto the bed. She was confused by the sudden action and before she could react, Issei was on top of her, looking eye to eye with her. Issei knew she could easily push him off if she wanted but she was clearly too stunned to think clearly. "How's this for indecent?"

"I–. You–. This is–" Raikou's brain had officially fried as she couldn't make a proper response. She stared at Issei's playful gaze and somehow calmed down. She stared back at him and she finally gave Issei's words some proper thought. She reflexively wanted to ask if he was ok with it but knew that if she did he would do something else reckless that would make her heart race. "Even if I become your woman, will you still call me Mama?"

Issei wasn't expecting that question and was momentarily embarrassed, but soon he made a slightly perverted smile. "Of course I will. You'll always be Mama Raikou, but that will just make our nighttime activities even more indecent, won't it?" The question caused Raikou's face to turn red again. "So, will you be mine?"

"Yes. I'm all yours," she said while extending her arms out to embrace him. Issei was in bliss as the two enjoyed themselves for the next few hours.

An update to this story after forever! These side stories will be inconsistent with their length but I wanted to get through some more ideas for this before moving on to some more creative stories. I would be open to ideas for possible side stories within these shorts but I have some plans for character interactions and shenanigans. But what do you all think of how I handled Raikou? I look forward to the comments as always. : )