This is a kink challenge from SkyGem! Hope you like it~
Warning: Smut.
As Tsuna prepared to launch an attack on his long-time home tutor, Reborn, he maximized his flames and accelerated toward the hitman. Even if Tsuna were to deny his title as Vongola Decimo, he would not be losing a fight against a strong Mafioso such as his tutor. The brunette held the wish to spar with the now-grown Reborn, who became uncursed from his Arcobaleno form, thanks to Checkerface. Now was his chance to test his limits, and his opponents'.
Reborn stood there before smirking in mock triumph. His student better impress him with all the techniques he had learned from the past three years of training.
Tsuna commenced the battle by taking a swing at Reborn, who swiftly dodged to the side, then flipping upside down to kick the man and throw another punch. Unfortunately, the hitman saw that coming and grabbed Tsuna's leg before another attack could occur. The brunette yelped in surprise, feeling the impact of the rigid ground smack his back roughly.
Using his Hyper Intuition, he sensed a growing sensual temptation from Reborn, and quickly looked up. Surely enough, the man was on top of him, pinning his limbs to the ground and licking his lips in delight.
Narrowing his eyes, the brunette suddenly hitched up from under Reborn and tackled him to the ground. Now that the boy was on top of the hitman, Reborn couldn't help but stare up at his student's HDW flame, flickering brightly on his forehead.
"It's my turn to make the decisions," Tsuna replied, gripping the man's arms while staring into his onyx eyes.
Reborn's eyebrows rose up, perplexed. It was new for the Vongola candidate to counter him like that.
"... You do know I'll have to punish you later."
The brunette smirked. His tutor had no idea of what he was capable of. "Not a chance."
He leaned in and whispered in Reborn's ear, "Do it with me or die."
The man's eyes widened. He obliged in fascination over Tsuna's intimidating voice.
Reborn grunted as Tsuna, still in HDWM, grinded his body against him. Beads of sweat glided from his forehead, a tinge of warmth and pleasure overwhelming him of his senses. They were now in the bedroom of the Sawada household, the curtains unopened in the dark, familiar room.
Reborn grasped Tsuna's fluffy hair and pressed his mouth against the brunette's lips, passionately combining his tongue with his students'. Tsuna broke off first and began licking the hitman's neck, gently biting and kissing it with a twist of satisfaction. The Mafioso moaned, letting Tsuna rub his thighs and move in a rocking motion on top of his bare body. The sighs and excessive sound of love filled the teen's room.
The two of them had never felt any happier. This was a better training practice than what they usually do.
Here it is~ Leave a review if you have any thoughts about this one-shot. :) Sayonara!