Btw if you didn't understand that was a lemon. So yeah this is a lemon

Shima sat at the end of the bed listening to music (the song above) and reading. Tobi sitting at the other side eating some of shima's pistachios while listening to the song that shima was playing, a huge grin spread across his face. They were the only ones home everyone else was on a mission. "Tobi likes this song it sounds like me! TOBI IS A GOOD BOY!" He cheered. Shima glanced up with a smirk. "Tobi also isn't wearing his mask. And do you even know what this song is about?" Shima asked turning off the screen of her phone. Shima had known tobi before he joined the akatsuki so she was plenty familiar with his actual face and Saw his mask as something just to be cute. They had been dating since before he joined also so he was perfectly comfortable with her seeing his face.

"Shima-Chan What is this song about?" Tobi asked. Shima choked on air at the question. She knew that he wasn't as innocent as people expected but there were times like this that made her wonder. "hun. I believe the songs about sex." You stated with a smile. "... oh..." he paused "SHIMA PUT ON THAT DRESS THAT MAKES YOU CURVY AND YOUR FAKE GLASSES. I'VE GOT AN IDEA." Tobi quickly hopped off then ran out for some things to play student and sensei with his love and left her confused. He knew for quite a while what her only kink was and that was it. He quickly changed into a school boy costume from last Halloween when he found out that kink.

Tobi ran back into the room and sat on the bed. "LETS PLAY SENSEI AND STUDENT SHIMA! YOU STAND THERE AND TEACH THE LESSON WHILE I PAY ATTENTION AND LEARN." Shima looked at him with a loving smile appreciating the effort he put in to make her happy. " ok then class... today we will be learning about... hmmm obito why don't you choose." She spoke softly. Leaning over his desk, part of her medium sized breasts showing.

Tobi glanced at his sensei. "Ahh sensei please. Um I mean... sexual intercourse." He spoke, when they played sensei and student the lesson was mostly on sexual intercourse then in the end of "class" the fulfilled the desires that built up. You paced around the class "teaching" occasionally whispering the good parts in tobi's ear.

Time skip to the end of class brought to you by hidans head in a toilet
Hidan: GET ME OUT OF THIS NASTY AS SHIT HOLE ASSHOLE
Me: No and watch your fucking language

You sat on tobi's "desk" (your bed) smirking. " obito could you please stay behind with me. I would like to thank you for your excellent behavior during class. Tobi definitely deserves a nice treat. So please stand up and come here." Shima said sitting on her work desk. Tobi stood up and skipped over to his sensei. "Yes shima." Shima pulled him to her and kissed him. Tobi smiled and kissed back, rubbing her sides in a circling motion. Shima sighed into the kiss. Tobi separated from shima and started kissing down her neck with occasional bites. Shima leaned her head to the side allowing him more access.

Tobi smirked and grabbed her dress. "For my presentation on sexual intercourse I will start with stripping you of everything." Tobi spoke softly as he undressed her. " my, my sensei, your so wet." He said tracing his fingers over her clit. Shima whined at obito. Obito chuckled and thrust a finger, shima produced a loud moan. Slowly obito moved his finger in and out adding a finger every once in a while. Shima moaned loudly as she finally orgasmed all over his fingers. He quickly took his fingers out and licked his fingers clean. She quickly stripped her student, then hopped off of her desk and got on her knees. Obito's dick stood tall and proud in front of her.

Shima took his member in her hand and licked the tip, Obito shuddered and moaned quietly. Shima smirked and put his whole member in her mouth and started bobbing and sucking leaving Obito a moaning mess. After not long obito moaned loudly and released his juices in her mouth. Shima slowly separated with an audible "pop".

Obito picked shima up and cleared off her desk. Moving all of her manga books to a neat pile on the ground knowing how grumpy she would get if he just threw it off. He layed her down on the desk then climbed on top of her. Shima looked up at him with clouds of lust in her eyes.

Obito kissed shima roughly then bit down her neck and down to her breasts, he quickly started nipping and sucking at her breasts switching to the other after a while. Shima moaned loudly as he bit her nipple. "im a good boy, right." Tobi mumbled in her ear. "Are you ready?"he asked. Shima looked at him and nodded. "please obito fuck me. Please your a really good boy" Obito smirked at her. " wow I didn't even have to tell you to beg. Your already begging for me. Good girl." He quickly pushed himself in her.

She screamed at the pain that shot through her. Obito jumped at her reaction and quickly pulled out. "IM SORRY IM SORRY. IM SO SORRY." He apologized looking scared. "Are you ok baby?"  Shima looked at him and laughed. "Yes. im fine please continue. It hurt a little, but it always does. Your pretty big." Obito laughed and muttered one last apology then thrust himself back in her but waiting to  move again until she said so. "Oh please tobi you can move now." She moaned. Obito smiled and thrust into her harder. Shima moaned and kissed him. He kissed back quickly then separated. "Why so quick to separate?" She asked with a hint of sadness in her voice. "Because I want to hear your moans and screams." He whispered in her ear as he thrust into her again. She moaned loudly. Obito smiled at her heavenly sounds. " babe you sound like an angel." He said kissing her cheek. " faster, harder obito, please." She begged he quickly obeyed and speed up and started slamming into her. Shima screamed and moaned continuously. After a while tobi and shima came together, then rode out their orgasm. After obito got his energy back he picked shima up and brought them to her bed, then layed down with her. Shima panted then kissed obito along his scars. "I love you tobi, your a REALLY good boy now. I'd give you an A. And if possible I would have give you an A plus." Tobi smiled and kissed her. "Tobi is a good boy and is good in school." He chuckled with a wink. Shima smiled then closed her eyes and drifted off into a dream of her walking around the hideout naked. ( I have dreams like this where I go out in public half naked, no one notices me, if I go to bed with no shirt of bra on. Or no pants and shirt. I only sleep like that when its to warm in my room, or im to warm and its cold in my room. Shrug) tobi followed you into a dreamless sleep.

Bonus

Deidara's POV

SHIMA IM HOME. I yelled from the entrance of the hideout, No answer. "I'VE GOT FOOD!" I yelled still no answer. I looked around then went to her room "knock knock." I said knocking on her door, still no answer. " ok im coming in." I yelled then opened the door, I looked around then turned red. Clothes were scattered across the room, white stuff was on Shima's desk, and there layed shima and some guy in her bed. I looked at Shima's nightstand and saw tobi's mask. ' oh great, tobi and shima had sex.' I thought, rolling my eyes. I swear one day im gonna kill him for taking my sister's virginity, and doing it without asking me. I closed the door gently not wanting to wake her up. If she wasn't there and wasn't sleeping, I would gladly slam the door and wake up tobi. A stomped away and went to my room, Shima's my sister she belongs to me, and me alone, even if they are dating.

( while I was writing this I accidentally called my dog otis, shima. XD I NOTICED THAT WRITING IT MAKES IT SEEM LONG BUT ONCE YOU READ ITS NOT THAT LONG. Ive had this good boy song on repeat the whole time I wrote this story)