Currently Levi, Yuki, Yuna, Nina, and lastly the 'boy' is in the Narumiya households. At that time Sera Narumiya's mother, Rina, wanted to invite the 'boy' to play at their house to accompany her daughter, but Sera called them while they are nearby and start to introduced them to her mother, resulted in her mother also inviting them to their home.
(A/N : Her name (Rina), I'm make it myself because in OG she doesn't have name, and was only called Sera's mother in Hanime if I remember, I tried to find it on Wiki but the result is nil.)
After the incident where that 'boy' intends to harass Sera in class, she becomes quite close to Levi even though Yuna and Nina doesn't like her a bit because of her bullying nature, but since she is just a kid now, they hopes in the future she will change so they let her close to Levi.
She not saying anything to her mother about that incident, so her mother was clueless about that 'boy' and just invite him to her house.
So when Levi and his girl is playing while Sera want to get close to him, that 'boy's was left alone in the couch fuming in anger and jealousy. He then demanded to Levi. "What are you doing here!! You haven't even spoken to Sera-chan since yesterday and you want to get close already!"
Levi then looking at the 'boy' like he was an idiot and said. "So? It's not even your house. Is there any problem for you? "
"Yeah!! You just here because my mother invite you, so don't get cocky like this is your house cause this is my house and I'm free to invite whoever I want!"
Sera said agreeing with Levi and stick ot her tongue toward the 'boy'. Truthfully she doesn't like him either.
Because previously he was weak and pussy kid but somehow he changed completely like someone else occupying his body. So while someone she liked cleary hostiles toward the 'boy' she happily support him.
In short: She is a simp.
Needless to say, Sera's words silenced whatever the boys wanted to say in defense. This really wasn't his house, so why bother if she invite Levi to her own house? unless he wants to do something to Sera and her mother if Levi wasn't around...
"But our classmates avoid him because he's a delinquent who likes to beat people up and what if he want do something to you!?" He said to convince Sera to stay away from Levi.
'Why, why always you who got all their attention?!!!'
Back when he just realized he was back at time. He started to make a plan about getting thing he cannot in his first life. His ultimate goal was of course to getting his crush's love; Kasumi Suzuhara, his big sister's bestfriend.
His next goal was getting revenge of his former bullys. One of his bullys was also his neighbour, so in the morning when he walked out from his house, Sera mother's, Rina greeted him which resulting in this situation.
But to his displeasure, Rina still treated him like when he was still in kindergarden. So in his retarded mind, he want to show her that he was already grown up by r*ping her to submission. That was when Sera intruped, so he changed his plan to r*pe them both at the same time.
"I don't give a damn toward their opinion! so you can just scram from my house because I have Levi to accompany me already!"
Boku-kun previous word was true though, because when Levi's beat up people who want to get close to his girlfriends, the result is those boys want to spread rumor about Levi being a delinquent and like to beat up people so no one will want to get close to him.
But their attemp was almost useless, because of that rumor many girls were more curious about him and wanted to approach him to just know who's he, even though some stupid boys believed the rumors out of jealousy and envy.
And the 'boy' awas obviously the latter kind of people.
"B-but your mother and I have been talking about this that I'm going to spend the night here because my sister is on her school trip!"
He gave her the reason why he should here, but apparently instead of concerned about that, she only look at him like he was greatest nuisance around her.
"Why I have to care about that? How about instead of my house, you can go under the bridge and sleep there?!"
"..."
Boku-kun didn't say anything, he just glared at Levi hatefully while cleched and uncleched his fist repeatly, he gave occasional gaze toward Sera only to find her face full of scorn when looked him.
'Why always you... why always you who got everything....'
He lowered his head only for suddenly rushing toward Sera like he want to r*pe her. Although he know Levi was around but he think it's will be alright because he gonna win when Levi's trying to stop him, because when he was in middle school he was taught martial arts which gave him the confidence to beat Levi if the fight come out.
His attempt might have been successful if it weren't for the four trained children who watched all this in silence and would act if the 'boy' did something suspicious. Like now.
*Crack*
There was the sound of something cracking as Levi 'gently' kicked him at his leg, resulting to his fall, head first.
"AHHHH!!!!" Boku-kun shouted in pain while holding his leg that now bruised to the blue.
Levi then grab the 'boy' collar and drag him to outside the house.
Severval minute later, Levi back again and sit down between his girls and playing again like nothing was happened just before.
Sera couldn't help but ask in confusion and fear because she hear something cracking.
"W-what d-did you just do to him?"
"Hmm? Nothing I'm just sent him back to his house." Levi answered nonchalantly.
"O-Okay... B-but why you kick him and I'm sure I heard something c-cracking just before?"
"Well, because he want to r*pe you?" Levi said like it was obvious, feeling weird such clear thing being asked by her.
"What is r*pe though?" Sera asked back in confusion clearly visible on her face.
""""...""""
Hearing that, Levi and his girls raisen their eyebrows simultaneously cause they couldn't believe that a bully girl like her would be so naive about such things.
Yuki give a mischievious smirk and said to innocent girl in front of her. "Come here then~ I will tell you about it."
[Again I love this girl. Maybe we can become sister, what's do you think about it master~?]
'Yeah, yeah I know. As for your question, I will think about it.'
[Please~]
'Yup. I have enough thinking. So nope.'
[Booo~ C'mon it's gonna be fun~]
'Can you stop already?'
[Hehe~ Nope.]
While Levi and Vermeil started bickering again. Meawhile in real world, Sera drew closer to Yuki, Yuki then started whispering beside her ear and told her about the birds and the bees. The longer Yuki told her, Sera's face got even redder by the second while she looked like she would be passed out just because of that.
In the end, Sera the looked at Levi and ask with a expectant look on her face, blushing heavily. "C-can w-we do i-it?"
(A/N : I know this is rushed, but fuck it! This is Hentai for you!)