Shout out to GalaxyNek0 thanks for suggesting and reading <3

No one could understand why? Why you're dating Nendou. Well yes Nendou was a little... ok a lot on the dumb side, but he was sweet in his own way. You fell for him when he helped you get your cat out of a tree. By the end of it he was cover with cat scratches and, he had fell out of the tree twice, but he didn't even care he just wanted to help you out. After getting to understand him a little better you ended up dating.
"Hey Yn! Hey! Hey! Look what I got you!"
Most people would have seen a bunch of mangled weeds but you knew he picked those flowers for you, trying to be sweet.
"Oh how sweet thank you Riki."
You hugged him. He blushes and scratches the back of his head, but then gets a serious look on his face.
"Yn?"
"Yes?"
"What's sex?"
You froze.
"Come again, I don't think I heard you right."
"What's sex? And why do all the guys keep asking if we did it? Did what? I don't get it."
Ok how were you going to explain this to him. You did wonder what that would be like with him. You ponder for a bit then got an evil idea.
"Riki if you come over to my house I'll show you, but this will be our little secret ok."
After school the two of you go to your house, and you take him to your room.
"Riki come here"
You pat the bed and he sits next to you. You pull out your laptop and type in porn. You play a video of a couple geting all hot and heavy. You blush getting excited a little.
"Ok Riki what the people in this video are doing is sex."
The girl in the video lets out a loud moan as the guy's fingers her, and you knowest your boyfriend's huge boner. 'Good God how does he hide that thing!' You thought. He's starting to pant.
"Yn I feel weird."
"I know, me too... do you want to try what they're doing in the video?"
He only nods. You remove your panties that are already a little wet.
"Riki you need to take your pants off to do this..."
You giggled as he fumbles to get his pants off. You eyes bug out. How the hell does he even walk around with that thing, its like a third leg. Before you say anything he pulls you into a hug. He cuddles you making you feel safe.
"Yn I'm not sure what to do now can you help me."
You look at him and nod.
After you prepare yourself you sit on top of him. It hurts at first but after awhile you still to move. It doesn't take long for the two of you to cum and he fills you up. You both flop down on the bed enjoying the afterglow. Then it dawned on you.
"Riki? Sweetie, do you know were babies come from?"
"Of course I do. The stork, obviously."
"Oh dear..."