A/N:: Hope you all enjoy what is to come~!

Pairing: MarcoAceSabo

Prompt: '"Why wasn't I invited?!" In which Thatch/Sabo catches Ace and Marco doing the dirty and Marco jokingly invite the man to join, to mess with Ace who is shocked and embarrassed, but he does and it turns amazing for everyone?' For himmelblu. (As you can see I picked Sabo XD)

Rating: M for nsfw

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The sash dug into Ace's forearms as his arms are secured behind his back and he rests on knees with a flushed body. Heat practically rolls off him as a hand grips to that favorite sash, used the most when tying up the other, and Ace quivered as he feels fingers pressing deeper in him to his prostate. A low moan leaves him, trying to keep his tone down as they don't want to get caught being in the large family home. Fingers begin pressing harshly and cause him to quiver with a choked sound as he arches and hears a chuckle.

"Careful, I didn't lock the door…" Marco whispers huskily into an ear and gains a soft groan. Dark eyes shift up before lids close as he lets out a shaky breath from fingers pulling away. The creaking of the bed and noticing hands grip to his hips to steady him in place makes Ace tremble in anticipation. Pressure at his entrance starts and has him shift to arch his back to get his butt enough to help make it easier. Small praises feather into a red ear and licks along the shell of it while settling inside fully. Soft moans leave Ace in bliss at finally getting to the main event, chest rapidly moving as he takes in the feel of hands lining along his sides.

"Hey, Ac—!" The two on the bed stiffen and Ace jerks his head to look over to green eyes flickering in surprise from the door that had been opened while talking. It's quiet, Ace feeling nervous that damn it who invited his best friend over? "Excuse, why wasn't I invited?" The question seems to be a joking manner, but surprises them all—Sabo not even sure why that slipped out.

"Oh?" Marco inquires and sends chills up Ace's back. "Why don't you join us then, yoi?" The invitation surprises Ace and Sabo, the two of them making eye contact before Ace gives a shaky breath at the feel of Marco pressing deep into with a tight grip. To Marco, either the other would stammer and leave or he would actually join in something that he was sure Ace would enjoy.

When the door closes with a click of the lock this time with an extra person in the room, it's proof enough that Sabo is interested. Ace had watched as his friend strips down, anticipation starting to swell in his belly and knowing what the other looks like but this was different. Now, he could let his dark eyes drink him in fully and gives a low moan of eagerness to what could transpire. It doesn't take too long for Sabo to sit on the bed with a half hard on, Marco shifting Ace to grip dark locks and shove him down to be bent over.

"Use his mouth, he likes when you take reigns." Marco instructs with gleaming blue eyes, sending a shiver through Sabo as he nods with a thick swallow. Sabo let's fingers run through dark hair to grip and receives a moan in return. Easily getting situated, he brings Ace's head lower and hitches in breath when a mouth begins sucking on the head of his cock.

At this point, Marco begins moving and causing the rocking rhythm that Ace seems to take advantage of with his arms still bound. Blue eyes watch his lover eagerly take the cock in his mouth with moans from his rocking. A smirk lines Marco as Sabo looks dazed at the way the mouth takes him in easily, setting a hand back to lounge as he watches Ace take him in, but still being cautious from pulling the head down too much. It's a sight, making Marco note how his observation had always been correct on how Ace really was someone who would be into polyamorous relationship and if Sabo was the other person, Marco wouldn't mind that one bit.

A hand unties the sash, letting Ace give a hum and causes Sabo to moan with a grip to dark hair. Hands move to touch along the new participant, Sabo startled that Ace was touching along his body and able to grip at a thigh to move himself to deep throat his cock. Sabo jolts with head thrown back, a shaky cry leaving him at the onslaught he wasn't expecting and grips to hair. Marco shifts to be over Ace more with harsh thrusts and Sabo hazily watches, feeling himself shudder with the curling in his abdomen.

"Next time you can be on this side, yoi." Marco comments, having green eyes snap to him in surprise before jerking as Ace is vehement on getting the man off. "Because you realize quick that Ace gets what he wants…" The comment is followed with a moan from mentioned male and Sabo is rocking into a warm mouth to reach his peak.

Ace would definitely want more now that Marco was on board.