Warning: Explicit sexual content.

Shiena didn't expect anything today. She acted like it was a normal day, like all the other one of the year. She went to school like almost every day and after she went to the manga café where she worked. She came back to her apartment at 21h30. Suzu and Kouko were already asleep, lying on the couch. They were hugging.

"They're already sleeping?" thought Shiena, surprised. "And what's up with their relation? They seem really close…"

The brunette headed to her bedroom and entered. She was surprised to see that Otoya was still awake, reading on of her mangas.

"Oh, Shiena! I was waiting for you"

Shiena approached from her girlfriend, taking the manga that she was reading.

"Otoya, how many times should I tell you that you can't take the mangas that I hide under my bed?"

"Huh, why? You're not into really weird stuff you know, don't need to be ashamed"

"I'm not…these are…personal" said Shiena, embarrassed.

The serial began to smirk, worrying the brunette.

"Who would have thought that you're into roleplay sex? Shiena can be so naughty sometime, haha. Hum, the other day I also saw that you had an interest into t…"

"Shut up!" shouted the brunette, blushing from shame.

Otoya took advantage of Shiena's embarrassment to grab her by her waist, bringing the brunette on the bed, before hugging her.

"Got you!" said Otoya, cheerfully.

Before that Shiena could protest, Otoya gave her a soft kiss on the lips, what surprised the brunette.

"Happy birthday, Shiena!"

The brunette didn't expect anything today, especially not that her girlfriend would know why this day was special.

"Huh?" that was the only thing that Shiena managed to say.

"Your birthday, it's January 28?"

"Yes, but…I'm just surprised…how do you know my birthday?" asked the brunette.

"Shuto-san told me. Hey, we have the same age now!"

Definitely, Suzu knew a lot of things. How did she find all these information?

"But, your birthday isn't suppose to be December 31?" asked Shiena. "You should have eighteen"

"Huh? No, I was only lying to Haru-chi. My birthday is March 10. Anymay, I'm your gift! Haha, just kidding" laughed Otoya.

"Well, I'll humbly accept your gift"

Otoya didn't expect this answer, and she certainly didn't expect what Shiena would do. The brunette suddenly grabbed her girlfriend's waist and pushed Otoya on her back, before getting on top of her, straddle her.

"Shiena, what are you doing?"

"Taking a better look at my birthday's gift" answered the brunette, before began to unbutton Otoya's shirt.

"Wait, that won't work. My pleasure isn't physical, this is what I did to others that bring me pleasure. The expression you had when I touched you, the cute moans you uttered when I made you come, this is what that gave me pleasure"

"I already made you come, several times"

"Yes, but I was drunk, or you were tied up. I told you, my pleasure is more mental than physical"

Shiena didn't listen to Otoya's laments and managed to remove her shirt, before to do the same thing with her bra.

"Your sexual pleasure with me is already different than with others, I only want to test something with you. You're not allowed to complain, don't forget that it's my birthday and that you're my gift"

"Shuto-san and Kaminaga-san will hear us…"

"Don't worry, they're sleeping, and you just have to keep your voice down"

The brunette slightly touched Otoya's belly with her fingers, heading to her crotch. The serial seemed to be scared by something. Probably because she was about to experiment something new for her. Shiena tried to remove her panties, but Otoya resisted a little bit.

"Please Otoya, let me try to pleasure you. You won't have to do anything, except trusting me"

Otoya hesitated for a moment, but she couldn't say no to her girlfriend. After all the bad things she did to Shiena, she felt like she had no right to refuse. The serial killer stopped resisting, allowing Shiena to go further. The brunette removed her panties and began to touch her womanhood. Otoya wasn't wet at all.

"This'll be more complicate that I thought" thought Shiena. "Maybe if I use my mouth…"

Shiena gave a slight lick on Otoya's clit. The serial killer let out a moan, more from surprise than pleasure, but it was good sign. The brunette began to lick Otoya's inner lips, while using her index to rub her clit. Otoya felt a strange sensation in her crotch. It was warmer, but not unpleasant. She even began to become a little bit wet and moaned from pleasure. Satisfied by her effect on her girlfriend, Shiena introduced her tongue inside Otoya's womanhood. Seeing that Otoya was enough wet, the brunette removed her tongue and penetrated her with two fingers. At the same time, Shiena was also licking her clit.

"S-Shiena, this is strange, I shouldn't feel like this, this is the first time…"

Otoya's thighs were shaking. Shiena knew that she was about to come soon. She moved faster her fingers inside of her and began to suck on Otoya's clit. The serial killer couldn't controle her voice anymore and uttered several moans. This sensation was too intense, she never felt something like that before. She could only concentrate on what she felt physically. Forgetting that they weren't alone, Otoya uttered a loud moan when she reached the climax.

Breathing heavily, the serial killer's was numb and her entire body was hot. It was the first time that she came because of someone else, without that she killed or dominated that person, or that she was under the effect of any substance.

"Otoya, are you alright? Did you feel good?"

The serial killer opened her eyes, gazing Shiena. Her eyes only expressed lust, lust for the brunette. Otoya suddenly jumped on her girlfriend and pressed her against the bed. She looked like a beast ready to eat her prey.

"I felt extremely good. So good in fact, I never felt like this before. You awake something inside of me and now, I only want to make you feel the same way that I was" said Otoya.

"Otoya, you drooling"

The serial killer wiped the saliva on her face, remembering something that Shiena told her the other day.

"May I? Come on Shiena, let your gift pleasuring you too"

"Y-yes, you can…" said the brunette. "Though, I don't have the impression that I have the choice" she thought.

"Don't worry, I won't hurt you" said Otoya, before removing Shiena's shirt, exposing her nude breasts.

Otoya began by fondle gently Shiena's breasts, before pinching slightly her nipples. It was enough to make the brunette moan. Otoya knew that her girlfriend had pretty sensitive breasts, it was easy for her to pleasure her only by playing with them. The serial killer began to suck on one of her nipples, while rubbing the other one. Those hands that could bring so much pain to others were also able to be tender and pleasurable. Even if she knew who was Otoya, Shiena trusted her and could put her body into her hands.

Otoya stopped to stimulate her breasts and began to remove Shiena's skirt and panties. But suddenly, the brunette wrapped her arms around Otoya's neck and gave her a deep and passionate kiss. The serial killer couldn't do otherwise than playing into her girlfriend's fluffy hair and stroking them gently. The brunette also put her legs around Otoya's waist, so that their pussies were touching. Their breasts were also rubbing together.

"I want to feel good with my gift" said Shiena.

"Well, we still have time, your birthday only finish at midnight"

Suzu wasn't asleep, but she couldn't hear a lot of things from Shiena's bedroom. But she heard enough to know what they were doing.

"Enjoy your birthday, Kenmochi-san. In your case, it is something that you should celebrate, especially with someone you love"

The older girl watched Kouko, who was still asleep. Suzu tenderly kissed Kouko's forehead, before smiling sadly.

"You're growing up too, Kouko-chan, while me, I'll be always look like a fifteen years old teenager. This is what I hate the most with my immortality, to not be able to grown up with the one I love"