It was a late night, and there was no people around the city. Only a few people are around this night and there are whispering noises. It was creepy and no one knows wby. The wind was pretty cold, and a cup of warmup drink is needed.

There was two Pichu, codenamed Trueno and Marino, enjoying the late night tea, and these two have just finished the drinks. Both are siblings and are starting some discussion.
"Hello, brother, since we've finished our tea, where do you want to go?" Marino asked.
"Do not let anyone know what we are doing. I will bring you to the alley." Trueno replied.
"For what?"
"Shhh... Your brother knows this. But I won't tell you for now."
"Hmmm... There might be surprises."
"Follow me." Trueno stands up, telling Marino to follow him.
"Good to know then. I am a bit less hesitant now." Marino followed. Both then go to the forest.

Marino does know about certain something about sex stuff, but she would be hesitant when someone asked her in publicity.
Trueno is pretty open and frat, but he has a smiling side when it comes to certain subjects.

"It's arrived, baby." Trueno told Marino as two have arrived through an alley.
"Oh really?" Marino was surprised.
"Real deal. Do you want to do here? Or should we go behind the corner?"
"Anyway, you can do."
"Okay." Trueno replied.

Marino then lies down on the floor, facing the upper layers of buildings and skies. She spreaded her arms and legs, for a relaxing sight.
Trueno was masturbating a bit, waving his arms and being prepared to own his little sister this time. He then sit in front of her spreading legs, seeing her little clit opening. His cock gets hot and hardened and he then drill it slowly into her immature opening.

Marino gets touched when Trueno places his fleshy rod under her, and was shocked. She looked at her brother, who's grappling her body and thrusting her little clit. She wasn't ready for sex and such but her brother forced her into that.

"Wha, what? Brother, don't do this to me!" Marino shouted in shock.
"Stop yelling, sister! No one is around but we shouldn't yell." Trueno pouted his sister's mouth, and slowed his pace down.

Marino then nodded and Trueno said to her "This is your first time but since you know something about this, I will give you a try."

As Trueno released his hand, Marino nodded again and said "Okay. I just don't want anyone to spot us. Just there are nobody around. You can continue your business."

Luckily, as Marino said, there are no people around the alley, and it was silent. Silent alley calms down the mind but the spooky area made everyone wanted to hide and run away.

As Trueno speeds up, Marino felt his thrust become hotter than she could think of. Faster than he could, Trueno feels his adrenaline pumping inside his body and firing his pace onto her. Marino was sweating and still have to see him pounding on her. Her hymen barrier was crashed by his explosive cock, in a second.

"How good was that?" Marino then asked.
"It was really fast. Damn fast." Trueno replied.
"You gotta do it... I cannot move this time..." Marino moaned as Trueno was still pounding her.
"Ookay... Take my stick!" Trueno replied as he slams Marino into the ravine.

Marino was able to speak but she feels hurt, which will be relieved in some minutes as she breathes heavily. Trueno is unable to resist his urge and he needs to deal with it.

Luckily, being Pichu, they are way too young to make babies until their Pikachu stage, thus safe from getting pregnant, which can be very risky.

After minutes of thrusting, Trueno unloads his cum into his sister's young tight pussy, flooding her tiny womb with his white hot cum. Marino didn't really feel the hot cum her brother released inside her, and she stayed calm.

Trueno then asked Marino "How good was it, girl?"
"Oh, yes. It was warm inside. A bit." Marino replied.
"You should take some more cum before I finish this." Trueno said sarcasmly.
"Uh, uuhh..." Marino moans softly as her belly gets a bit pain.

As Trueno's spraying some more cum, Marino feels her belly bulging a bit. Her little is now fillied up with her brother's cum and is continuing to be squeezed by the cum builds. The big brother is continuing his cum build into his little sister's little womb, and further squeezing it. Until he finished all his cum.

After minutes of mass-cumming, Trueno finished his cum and he slowed his pace, pulling some parts of his now-softened cock out of his little sister.

Marino was also relieved as her brother pulled his cock out from her little pussy. Relaxing, her inside was full of his cum and started leaking out as well.

Trueno then asked Marino about this.
"Ah, was it feeling good?"
"Ah, it was really that great, bro."
"I am done finishing cumming. Your insides are really tight, sis."
"Your shaft is really too big for me, bro!"
"Let me tell you. I got into fitness and gymnastics, so this is why."
"Okay. Brother. Do you have anything to ask?"
"Well, you may wish to join the gangbang party if you could. My friends join that sometimes."
"Okay. Let's go back home, brother."

Trueno nodded after a conversation, and followed Marino to go back to the home base as well.