Grian had been planning this prank for months. He was going to blow up mumbo's camper van. It probably wasn't the smartest idea but he saw no problem with it. When the clock struck midnight he crept out his house and walked over to mumbo's.

He stood outside, TNT in one hand and a flint and steel in the other. He looked through the window, not being able to see Mumbo. He smirked as he slowly opened the door and walked in. He was immediately pushed against the wall by a muscular, tall man. He studied the mans body figure, slowly getting a hard-on.

"Well what a surprise! Grian." Mumbo muttered to him.

"I- uh- mu- hi-" Grian Couldn't stop himself from stuttering between every word. He dropped the TNT and flint 'n' steel on the floor already, his hands pressed against the wall behind him.

"Is there something you need~?" Mumbo bent down, looking the smaller man in the eyes.

"I- was- here- to uh- prank you-..." Grian stuttered, immediately breaking the eye contact between the two men.

Mumbo slid his thigh in between Grians crotch causing the smaller man to let out a gasp. Grian looked up at mumbo, who was now smirking.

"It's only been 2 minutes and you already look like a slut." Mumbo muttered into grians ear, as he began kissing and biting at his neck.

"Ah~.." Grian moaned, immediately covering his mouth after. But Mumbo wanted to hear every noise that came out of Grian. He removed Grians hand and began rubbing his thigh in between Grians crotch.

"M-mumbo~!" Grian squirmed, holding himself back from grinding against the taller man. He was now gripping onto Mumbos suit.

"Shhh, you wouldn't want someone to hear would you~?" Mumbos breathing was right against grians neck, making him hornier by the second. He kept rubbing his thigh against the smaller ones cock, gradually picking up the pace every 5 minutes.

"Mmm~ D-daddy.." he moaned, as he began to grind against Mumbos thigh trying to get more pleasure. He was already close to the edge but he kept going. His hips stuttered as he became a moaning wreck.

"Isn't that a good slut..~" Mumbo's voice was in a low, pleasing tone. This exited Grian even more.

"M~Mumbo...I'm g-gonna-" He was cut off by a loud moan, as a damp patch began to show through his jeans. He was panting heavily as he stopped grinding.

"Not even 10 minutes in and you've already came... I'm gonna have to punish you for that one~"

"P-Please do daddy..." Grian moaned into Mumbos ear, making the taller mans eyes widen.

Grian began kissing Mumbo, as he slid his hand onto the taller mans crotch. Mumbo felt Grians hand in his area as he let out a soft moan into their kiss.

Grian began unbuttoning Mumbos jacket, sliding it off. Mumbo kept Grian pinned against the wall, kissing him more roughly every time.

A few minutes later and mumbo was sat on the floor, getting jerked off by his own best friend.

As much as he thought it was weird, he wasn't complaining.

"A-ah fuck.. Grian~.." he moaned, gripping the wall behind him.

"Look at you, a slutty mess. Just for me~" Grian chuckled, as he began taking off his own jeans.

After Grian was done undressing himself he slowly began sitting down on his best friends manhood.

"G-Gri~!!" Mumbo moaned, throwing his head back. Grian took that as a sign to begin bouncing. Which was what he did. He started off slow but gradually began picking up the pace. Mumbo grabbed Grians waist and began bouncing him faster.

"M~Mumby~!" He threw his head down onto Mumbos shoulder in pleasure.

Scar and impulse were just taking a casual stroll before they looked at Mumbos Camper van.

"Uhh- Scar-" impulse tapped scars shoulder and pointed to the direction of moaning.

They walked up to the window, looking in then immediately looking out again.

"Oh my god was that Grian and Mumbo-" impulse turned to scar, his eyes widened.

"I-I think so-" The two slowly backed away from the window.

"We both saw the same thing right-?"

"Definitely." They both just walked away.

Grian had already gotten himself dressed again, as he stared at the taller man who was now sweating and panting.

"Oh come on Mumby. If you wanna be a top you gotta act like one~!" Grian chuckled as he left, sneaking back to his own house.

I- Did i just fuck Grian?! Holy shit he really knows how to control someone with just a touch. His tight ass. Everything about his body makes me want to fuck him harder.

Mumbo stood up, dressed himself then immediately fell into his bed and began sleeping.