Despite the fact that Ruby and Yang were in a relationship, the older girl's role as the younger one's big sister didn't really end. This meant that even if the two girls weren't really related and were now girlfriends, Yang would still hold on to her more sisterly duties. These duties included protecting Ruby and giving her advice on life. The first one was something that caused the redhead quite a bit of trouble, but the second one might have been and even bigger source of problems.

While Yang wasn't a bad person at all, she was not exactly what one might consider a good influence or a role model. Now, that didn't mean that she didn't have her good qualities. In fact, there were a lot of great things about the blonde girl. She was friendly, positive, a skilled fighter, loyal and strong, just to name a few great things about her. However, like anyone else, Yang did come with her bad sides.

When it came to the older girl giving advice, Ruby often learned by her being an example of what you should NOT do. For example, by seeing what happened to Yang, the redhead had very quickly learned the value of studying properly, and to not drink alcohol. By seeing the brawler having to retake tests and getting into all sorts of accidents in a drunken state, Ruby had learned some valuable lessons.

However, Yang didn't teach the younger girl only through being a role model of what not to do. Sometimes, she liked to actually sit down with Ruby and teach her about things that were important. This would have been fine, if it weren't for the fact that what the older girl saw as important often wasn't or was something that Ruby didn't need to hear. One such case was just about to happen.

It was a normal day in team RWBY's dorm with most of the team in the room, doing their own things. Ruby was playing games on her Scroll, Blake reading one of her numerous erotic novels and Weiss was going through her notes. The only one that was missing was Yang, but the blonde girl would soon appear.

Suddenly, the door to the dorm was kicked open and Yang walked in. Weiss was about to scold her teammate about properly opening doors, but stopped upon seeing the look on the brawler's face. Instead of the usual happy smile or goofy grin, Yang had a stern look on her face, like she was walking into battle. The blonde walked into the middle of the room and looked around, taking note of everyone there.

''Yang? Is something wrong?'' Ruby asked carefully, worried over her girlfriend. Weiss and Blake were also staring at their teammate with a mix of curiosity and worry on their faces.

''Everybody except Ruby out,'' Yang suddenly commanded.

''W-What?'' Blake asked, a bit shocked over the sudden demand.

''I said OUT!'' the brawler yelled and went to grab both her partner and Weiss, before throwing them out of the room.

''You brute! What do you think you're doing!?'' Weiss screamed angrily. ''You can't just throw us out like this!''

''I just did, didn't I?'' Yang asked mockingly. ''Besides, all I need is some time alone with Rubes. I'll call you when you can come back.''

''But my Scroll is-!'' Blake tried to say, only to have her partner slam the door shut and lock it. ''...still in there.''

The monochrome duo sat in the middle of the hallway, still in a bit of shock over what had just happened.

''So... Do you have your Scroll with you?'' Blake asked Weiss, hoping that her teammate at least had a way to contact their other teammates.

''Unfortunately, no. It's still in the dorm,'' the heiress answered in a frustrated tone as she stood up. ''Honestly, what is wrong with Yang now!? Why would she need to throw us out like trash!?''

''I have no idea, but we can't do much about it,'' the cat faunus answered with a sigh. ''We should just go spend some time in the library and come back later. Maybe then we can go back inside the dorm.''

Despite not liking the fact that she had been driven out of her team's dorm, Weiss nodded at Blake's suggestion. Whether she liked it or not, it was best to just get away from Yang's crazy antics for the moment. Otherwise, they might get dragged into them.

The monochrome duo was just about to start heading towards the library, when Weiss noticed Blake's book on the floor. The raven-haired girl had been holding onto it when they had been thrown out, so it flew with them. The heiress picked up the book and was going to give it to her teammate, but her curiosity got the best of her and she decided to take a look at what Blake had been reading.

''Weiss, is something wrong?'' the cat faunus asked upon seeing that her teammate wasn't moving. She then noticed what the white-haired girl was occupied with and her face turned red from embarrassment. ''W-Where did that come from!?''

Weiss lowered the book, showing the wide-eyed and pale look on her face. Whatever she had just read had apparently struck the heiress down to her soul, as she looked like she had seen a ghost.

''W-Weiss?'' Blake called out to her teammate carefully. ''Is everything okay?''

''You know you could get arrested for owning stuff like this, right?'' Weiss asked with the same haunted look on her face.

Back in the dorm room, Ruby was nervously watching as Yang didn't just lock the door, but also the window, as well. After the blonde had locked both possible exits to the room, she grabbed a chair and placed it in the middle of the room.

''Y-Yang? What's going on?'' Ruby asked, a bit concerned over her girlfriend's actions. ''Is something wrong?''

''Nothing's wrong, Rubes. I just need to talk with you about something very important,'' Yang answered. ''Come sit on this chair and we can get to it.''

The redhead got up from her bed and jumped down. She then sat on the chair, like the older girl had instructed her. Despite Yang saying that nothing was wrong, the redhead was still very nervous and was even sweating a bit.

''Now, you're probably wondering why I needed to make all these preparations, right?'' Yang asked to which Ruby nodded. ''The reason I went to such lengths to ensure our privacy was because what I want to talk to you about is very important. I don't want there to be any distractions for us.''

The young team leader simply gave a nod, showing that she understood what the brawler was saying.

''So anyways, I want to talk about something important. Now that you have reached a certain age, you might have noticed some changes in you. These are all natural and you shouldn't be afraid of them. For instance, your body has started to develop,'' Yang began to explain. After the last part of her explanation's beginning, a rather perverted grin spread over her face as she looked over Ruby. ''And in all the right areas, too.''

The younger girl turned redder than her cloak and covered herself with her arms. While the blonde may have been her girlfriend, it was still a bit unsettling to have Yang basically undress her with her eyes.

''I-Is there a point to what you're talking about!?'' Ruby asked in a mix of anger and embarrassment.

''Well, the thing I was getting at is that your changes aren't just physical,'' the brawler answered. ''You may have also noticed changes in the way you think and see things. Particularly, when it comes to people who are attractive, like your hot bombshell of a girlfriend here.''

The redhead blushed again from what Yang said. While she had no doubts that the older girl was gorgeous, having it brought up like that was something Ruby couldn't help but blush at.

However, the younger girl started to realize what her girlfriend was talking about. Her eyes went wide as she looked at Yang and hoped that she was wrong.

''Yang, please don't tell me that you're-''

''And with this change of thinking and seeing things, you are bound to have certain types of feelings. Feelings that are completely new and possibly even scary,'' the blonde continued her explanation. ''However, I want to assure you that there is nothing to be afraid of, as these feelings are completely natural and nothing to be worried about.''

''Oh my good Lord, you actually are-''

''Now, the thing about these feelings is that they can lead to certain little... Let's call them ''games'' between people who have similar feelings towards each other.'' Yang went on, completely ignoring Ruby. ''While you are still a bit too young to take part in these games, I want to assure you that I will be there for your first time, when you are ready. I mean, that's what a loyal lover is for, am I right?''

''Yang... seriously... Just stop,'' the redhead pleaded in a pained voice. The sheer embarrassment of the situation was actually hurting her.

''As to what these ''games'' are like, I don't think I can properly describe them by just using words,'' the blonde said as she walked up to her partner's bookshelf. ''I believe that Blake has something here that might-''

Yang was cut off by Ruby suddenly standing up and walking towards the door at a fast pace.

''Yang, I love you with all my heart, but seriously, the last thing I want from you is a crash course in sex education!'' the scythe-wielder yelled with her face completely red as she unlocked the door and opened it. ''I'll be at the workshop. I need a moment to cool off.''

The brawler could only watch as her girlfriend slammed the door behind her, leaving Yang alone in the dorm. The blonde looked down at some of the books she had managed to gather, before looking at the door again.

''Well, that sucks. I didn't even get through the prologue and I had plans for a whole lot of things I could teach her about,'' Yang said to herself as she opened one of Blake's smut books and looked at it. ''Some other day, I guess...''