A/N: This is another 2013 unedited story but it's one sided love on Natsu's part because Gray got Juvia whom I adore. If I didn't ship Gray with Natsu so hard, Gruvia would be my OTP.
He clutched at his chest as his heart tried to pound its way out of it, it was racing so hard, so fast. His eyes were wide and unseeing as he pressed up tightly against the wall. He stood just behind a slightly ajar door, listening to the moans, the whimpers his rival emitted from Juvia.
The hands at his chest clenched together and he quietly peered through the crack in the door to look into the room he accidentally stumbled on. He didn't know why he did it, stay hidden and watch the scene before him like some sick voyeur. It would only result him with a heavy heart. Yet he continued to stare at the alluring scene.
Fully clothed for once in his life and laying with his back on the bed was Gray Fullbuster. The sexy teen wore his signature all black attire; fitted denim jeans with a thick belt along with a tight V-neck shirt.
The girl however, was completely naked and on top, grinding her pussy against Gray's face. Juvia was making the most noise, all pleasure filled and high pitched. Her hips stuttered, she gyrating them and swiveled them all around while Gray assisted her by gripping her soft pale ass and rolled her lower body forward into his open mouth.
From time to time he could see Gray's mouth sucking her pussy lips, heart stuttering when the older boy's tongue would flick out and slip inside the girl's wet cave. Juvia threw her head back, her long blue hair cascading down her back from the movement.
"G-Gray~!" she howled, hands behind her and settled on Gray's abdomen. She leaned back on them and continued her thrusting while her fingers greedily peeled the fabric of his shirt up.
From his position at the doorway, his eyes could clearly make out the delicious tone muscles Gray owned and his breath hitched. The smooth looked skin to touch and taut to perfection. He watched Juvia's fingers greedily run over the exposed skin before trailing further down where Gray's prominent erection arched from the tightness of his jeans.
Why?
He watched Gray run his own fingers up and down Juvia's legs that were bent on either side of his face as the girl's breathing picked up. She arched backwards, body quaking with pleasure. "G-G-G-Gray~!" Juvia bounced herself on Gray's mouth, quite enjoying the slick tongue in between her lips. She fell forward suddenly and braced herself on the wall.
He saw Gray spread her ass cheeks and yank her further down. Juvia screamed. His heart crumbled. He turned away when Gray let one of her mounds go and used the hand to unbuckle his belt and jeans.
He pressed himself back up against the wall, eyes shut tight as the sounds of what went on in the room swarmed inside his ears.
Why? Why can't that be me?
A particular thrust from Gray had Juvia choking out his name in a high pitched sob. Gray strained his ears, for under Juvia's wails of pleasure, he could have sworn he heard light footsteps patter away nearby.
That won't ever be me.
He ran.
Gray won't ever be mine.