A/N: Modern AU. Also yes, Neo is wearing that. Also, again, could not come up with a good title for this one.

3rd Person POV

In all of her life, Ruby had never seen her sister look so... upset. Her eyes looked red and puffy, her hair was in a huge mess, and he clothes were wrinkled. Each time she tried to ask Yang what was wrong, the blonde would always respond with, "It's nothing Ruby. Just a little tired as all." For the first few days the redhead bought it, but seeing her like this for a straight week bothered her to the core. She needed to know. Currently, Ruby stood outside of her sister's room, a look of concern on her face. Lightly, she tapped on the wooden door. "Sis? It's me, Ruby. Can I come in?" After a few moments of silence, Ruby knocked again. "Sis come on, open up. You can't keep acting like this. You've missed a whole week of school and-"

To Ruby's surprise, the door opened up to reveal her sister who, once again, looked worse for wear. "What do you want Ruby? Haven't I told you I'm just a bit tired?" The redhead took a step back and Yang's eyes quickly widened "I-I'm so sorry Ruby. I... I didn't mean to snap at you. I... I just..."

"Yang if something's bothering you, you can talk to me. Heck, you can talk to Dad too. Just... Tell me what's up. I don't wanna keep worrying about you." Hearing the concern and worry in her sister's voice, Yang pulled Ruby into her room before slamming the door shut. "Ruby, I need you to promise not to tell anyone, okay? Not Weiss, not Jaune, Pyrrha, Ren, Nora, or even Dad. Got it?" Ruby nodded slowly before taking a seat on her sister's bed. "I promise. I just want to know what's wrong."

"...I... I broke up with my boyfriend. Or rather, he broke up with me..."
"You had a boyfriend?!"
"Ruby, keep it down!"
"S-Sorry. I... I'm just surprised since you... never told me about him. Why did he break up with you?"
"...Remember that list of people I told you not to tell."
"Yeah. Blake, Weiss, Jaune, Nora, Pyrrha, Ren, and Dad."
"I never said Blake..."
"...Did... Did he leave you for Blake?"
"No. I... Ruby..."
"What happened?"

A sigh escaped Yang's lips as her gaze shifted to the wall. For a few minutes, Yang stared at it, finding it more interesting than anything she's ever seen. "Yang, you said you would tell me." The blonde looked at her sister before nodding slowly "Yeah... I did. Well... Ruby, Blake and I... got together for a bit." The redhead's eyes widened and she slowly stood up "You and Blake are..."

"Bi, yeah. Though... I had did it behind his back and..."
"Yang why?"
"I... I got too greedy okay? I... I was losing feelings for him and... Blake confessed to me after she and Sun broke up."
"Damn it Yang..."
"I couldn't just break her heart sis. We... We went on small dates so he wouldn't notice...and then they got...bigger and we did more... stuff..."
"...Did... Did he find out last week?"
"Yeah. That's why I've been like this..."

Flashback

"Do you think you'll be free today? I don't have any clubs today."
"Yeah. I don't have practice for volleyball so we can meet up. Where?"
"Well... my place?"
"...What do you have in mind?"
"I... I was just curious if..."

"Yang, are you gonna... Oh I didn't see you there Blake." Yang's eyes widened and she quickly turned around to see Y/N, her current boyfriend. "Hey Y/N, what did Yang have?" Blake wrapped her arms around Yang's waist and the blonde began to sweat a bit. She was hoping that Blake wouldn't do anything to give Y/N any ideas. Sadly, she was wrong. "I was gonna ask if she was busy tonight. Were you guys talking about girl stuff? I mean, I can leave..."

"Sorry Y/N, but this lovely blonde is taken." Blake took her arms away from Yang's waist and stood beside her "Oh? So what are you girls doing? A thing with Ruby, Pyrrha, and Nora or..." Blake shook her head and smile "Nope. It'll be a surprise." Before Yang could say anything, Blake turned her head and planted her lips on hers. At this moment, time seemed to stop for Yang. Her eyes quickly moved over to Y/N, who dropped his book bag...and his jaw. After what felt like hours, Blake took her lips away from Yang's before walking away.

"..."
"Y/N, I... I can explain."
"..."
"I... I didn't want to break her heart. She... She just broke up with Sun and..."
"..."
"She... She looked like she was going through a rough time so... y-yeah..."
"...You... You..."
"..."
"... and her..."
"Y...Yeah."
"How long..." There wasn't any anger in his voice nor was there sadness. That didn't mean there was intrigue though.
"Three... week ago."

Without saying another word, Y/N picked up his book bag and walked off. "Y-Y/N wait! This... This doesn't mean I don't still love you. I... I..." Y/N stopped for a moment, waiting for her to finish. However, as Yang tried to say something else...nothing came out. Just pure silence. After awhile, he sighed and walked once again.

End Flashback

"After that he called me and told me that he and I... were done."
"Sis..."
"I... I should have just said no to Blake. If I did... I would still have Y/N..."
"Well...you still have Blake, right?"
"I... I don't. After Y/N broke up with me, I... I told Blake that we couldn't see each other. I was too heartbroken when Y/N broke up with me. I... I couldn't date anyone else..."
"Have you tried talking with him?"
"Yeah, but he never answers back."

Slowly, tears fell out from Yang's eyes. "I should've said no..."

With Y/N

Some guys would believe that having another girl in your relationship would be amazing. Two beautiful girls in a relation with one guy would be a godsend... but Y/N wasn't like that. To Y/N it didn't matter who Yang cheated on him with. Cheating was cheating. However...this didn't stop him from thinking he did the wrong thing. Yang was just trying to help Blake...but she did things behind his back. Did he do the right thing... or was it stupid to break up with her?

As he sat on a park bench, he felt a pair of hands cover his eyes "Finally here huh?" A soft chuckle escaped his lips as the hands removed themselves. A short girl with pink and brown hair sat down beside him, a large grin dawning her face. This girl was Neapolitan, or Neo for short. "Neo... do you mind if I ask you something?" The short girl shrugged before crossing her legs "Do... Do you think breaking up with Yang was the right move?" The small girl pulled out her scroll and began to type away.

"She did cheat on you so yeah."
"But she was helping out a friend..."
"Y/N, she cheated on you. Cheating is cheating no matter how you look at. You know that she has been with her for three weeks, so why are you wonder this?"
"...Yeah, you're right. Chalk it up to you...again." Neo smirked before placing her head on his shoulder.
"I'm tired. You had me walk all the way over here for a quick talk."
"A quick and important one."
"Yep."
"How about I pay you back? Ice cream?"
"Yes please!"

Time Skip

"And this why we don't give you a lot of ice cream..." A small chuckle escaped Y/N's lips as he continued to carry Neo to her house via piggyback. The ice cream themed girl had fallen asleep during her 7th bowl of ice cream and Y/N, obviously, felt as if he needed to take her home. However, as he kept walking, an old memory popped into his head. He had done something like this when Yang had gotten drunk with a few of her other friends...
____________________________________________________________________
"Alright Yang, let's go."
"But I don't wanna Mr. Unicorn man!"
"I'm not... damn it Yang..." Y/N sighed as he felt Yang's grip tighten. The blonde giggled softly and kissed the back of his neck.
"You know Mr. Unicorn... you remind me of a guy named... Y/N. You know him?"
"Nope. He sounds weird."
"Hey! That is my boyfriend you're talking about! I'll kick your horse ass!"
"Fine fine, I'm sorry. So, tell me about him."

Yang clicked her tongue for a moment before starting "Well, he's... a guy. He's a very nice... chill guy who tries his best at everything. He... He isn't... much of a drinker. He doesn't like me drinking. He also loves me...for me and I... I've never dated someone like that..."

"Oh?" This was new to him.
"Yeah. Every other guy before him just wanted me for my breast or my ass. Always trying to bang so they could say they fucked me. This guy though... He is a true gentleman. He knows how to treat me right... and I... I-I..." A small frown formed on his face as he heard her sobbing softly. Slowly, he puts her down and wipes away her tears.

"Hey, no crying on the ride."
"I... I'm sorry Mr. Unicorn, I... I'm just happy to have someone who wants me, you know?"
"Yeah... I know."
"If Y/N was here... I'd tell him everything. I'd kiss him too..."
"Yang, do you wanna know something?"
"What?"
"You're talking to Y/N right now."
"Y/N?! You're a unicorn?"

Y/N rolled his eyes before planting his lips on hers "Whatever you say Yang."

"I... I love you..."
"I love you too."
____________________________________________________________________

"Maybe... I would still be saying that..." Y/N sighed as he brought his hand up to the door, knocking lightly. After a few moments, a man white orange hair and a white jacket opened the door. This was Roman Torchwick, Neo's "brother" of sorts. "Hey Roman, just came to drop this little ice cream cone off." Roman rolled his eyes before stepping aside and letting Y/N in "Just take her to her room." As Y/N walked up the steps, a smile formed on Roman's face "I wonder if that's going anywhere..."

A/N: Awhile ago, I posed the question of "What if your girlfriend cheated on you with another girl?" and I got a lot of responses. So now I pose the question again. Also, how would you react after your answer?