Ace woke up covered in sweat and a bulge under his pants, he looked out the window and saw that it was still dark outside, he sat up throwing his blanket aside in the progress and groaned loudly when his erection rubbed against the callous surface of his pants. He considered stroking himself but Luffy was sleeping peacefully next to hi…. Luffy was next to him…, he stopped himself, 'No! Luffy is my sister! I can't do that to her!' but his mind went against what he thought as not so innocent images of Luffy flashed in his mind, He covered his face with his hands and groaned loudly as mentally kicked himself for the vulgar images he created of his surrogate sister, "Ace is that you?" Ace froze and turned around and saw Luffy sitting up rubbing her eyes, "Oh.. Uhhmm… Luffy you're awake!" Ace nervously responded to his sister,
Luffy gave Ace a worried look, "Are you okay Ace? your face is all red".
"..."
Luffy crawled towards Ace until he was a arms length away from her.
Seeing her on her four and what his vulgar mind was feeding him broke whatever self control he had.
He grabbed Luffy's shoulders and pushed her down and went on top of her and smashed his mouth to hers.
Luffy tried to push him away but Ace was stronger than her and pinned her down with his whole body, with his erection rubbing against her thigh.
Ace pulled away, he grabbed her t-shirt by the collar and forcibly pulled it over her head.
"Ace, what are you doing!", Luffy cried.
Ace looked down at Luffy and took no notice of her scared look and took in the sight of her supple breast which she was trying to cover up with her arms.
He swatted her arms away and cupped her breast with one hand and caressed the soft skin with his thumb and took her other breast with his mouth and sucked and licked her nipple and felt it stiffen.
Luffy whimpered under him and tried to hit him but Ace grabbed both of her slender wrist with his hand.
Ace shoved his other hand into her pants and caressed her heat and Luffy mewled under him in response.
He inserted his index finger inside of her making her cry out and she stopped resisting against him. He started pushing his finger in and out in a steady rhythm with his finger and felt her moisten.
He inserted another finger and Luffy moaned loudly."Ace...Faster…" Luffy gasped.
Ace smirked and started to slow down and eventually pulled his fingers out and started to lick the juice that covered his finger.
"Aceeeee..." Luffy whined.
Ace pulled Luffy up and gently guided her head to his dick.
Luffy looked up at Ace with a quizzical look on her face.
"Lick it"
Luffy obeyed him and licked the pre-cum that surrounded the tip of his dick and when there weren't any on his dick anymore she took him completely in her mouth and started sucking it with passion.
She swirled her tongue around his dick and used her hand to stroke the area she was unable to cover with her mouth.
"Shit…" Ace gasped as he felt pressure build up inside him, "Luffy….sto.." Ace was cut off as he came into her mouth.
Luffy swallowed the load and licked his dick clean and looked up at her brother with her adorable eyes.
Ace pushed her down with her legs spread, he ripped her underwear off and positioned himself to her opening and slammed into her.
Luffy cried out in pain as her hymen was stretched by Ace's dick, the devil fruit she ate prevented her hymen from being ruptured Ace paused for a second and gave Luffy a look that was a combination of guilt and worry. Luffy gave him a slight smile in an attempt to reassure him.
Ace found a steady rhythm as he pushed in and out of her opening.
Luffy was moaning louder and louder as Ace steadily picked up the pace as he felt the heat that radiated from her body against his with her breast pushed against his chest.
"Ace...wai...stop...", Luffy moaned.
With a final thrust into her by Ace she orgasmed and she squeezed against Ace's dick forcing him to pull out and come on her stomach.
Luffy, panting swiped her finger against her stomach, covering her finger with Ace's cum and licked her finger.
And with that Ace's erection sprang back up.