This is the last chapter... But rejoice, for I am making a real fic of 'Welcome to the Team'! Real, for me, qualifying as it'll end in about thirty chapters when I decide to stop. So prepare, o humbled mudmonkeys, for the reign of showersexsmutt has now begun!
Dean/Balthazar/Sam. THIS IS YOUR WARNING. IF YOU'RE NOT A SEXY WINCESTUALTHREESOME FAN, STOP READING.

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If you're still here... Let the sexy wincsestualthreesome begin! xD

Dean was sat on the Impala's hood when Balthazar and I returned from our... 'research'.
He was upholding the most spectacular bitchface of all time, and he glared at Balthazar with venom. 'Still here, asshole?'
Balthazar glared at my brother with malice, then smiled. 'Speaking of assholes...'
'Don't even think about it!' Dean hissed, standing straight.
'I already... I already know.' I interrupted quietly. Dean seemed at a loss for words, and I chuckled dryly on the inside. The infamous Dean Winchester, bottomed out for an angel...
'I want both of you at the same time.' Balthazar stated matter-of-factly.
Dean and I stared at Balthazar with something close to disbelief. Then- 'No freakin' way!' Dean was up in the angel's personal space, eyes narrowed. 'After before? I wouldn't t-'
Dean cut himself off, brushing his lips across Balthazar's, then leaping back. 'Sorry, I-'
Balthazar was smiling, holding a hand over Dean's mouth. 'Sh-hh, darling... Bottom, middle or top?'
Through the flesh of the angel's palm, I heard Dean whimper 'Bottom'. Which shocked me a little, both the position and the agreement to be fucked yet again by the angel.
'Sammy?' Balthazar turned to me, as if fully expecting me to agree.
'Never gonna happen.' I replied instantly, eyes narrowed.
'Aww, come on Darling...?'
'Yeah Sammy. Be spontaneous.' Dean was- astoundingly- smirking. 'Please?'
Dean's slight beg and my own want made me groan and glare at Balthazar.
'Top.'

NO PoV
Dean's hands were cuffed to the headboard, naked body lain out for all to see as Balthazar licked his way down the hunter's muscular form. Dean shivered as Balthazar straddled his hips, sparing a glance to his brother, Sam, who was was on the other bed, palming his hard cock gently.
It had been awkward at first, each seeing the other in such a vulnerable state, but then they'd quickly adjusted to the situation, with the help of a few careful caresses from Balthazar.
The angel shot Sam a glance, then smirked. 'Your brother's lips taste heavenly... Come, try him, Darling.' Balthazar smiled as Sam looked at his brother nervously, catching slight nod of Dean's head, and the minute tremble as he swallowed anxiously. Sam got to his feet, rocking on the balls of his feet before striding over, leaning over to breathe gently against his brother's cheek.
'Do you want me to..?' He whispered. Dean nodded again, and Sam closed the gap between he and his brother. Satin slid over velvet, and Dean groaned a little, mouth opening to allow his brother more access.
Balthazar chuckled dryly, then thrust into Dean roughly, catching the hunter by surprise. 'Sa-am...' The angel hissed, shaking his ass teasingly as he thrust painstakingly slowly inside the older hunter.
Sam bit down gently on his brother's lip before kneeling over Balthazar, one hand on the quivering angel's back as the hunter guided himself in slowly. When he was fully sheathed, the three of them lay still for a moment, shaking a little with effort and ragged breathing filling the air.
'Fucking move already...' Dean growled, pressing his face into his bicep when Balthazar placed a chaste kiss over his nipple. Balthazar obligingly began to shift, thrusting into Dean before drawing back, impaling himself on Sam. The youngest surrendered with a growl, hips pumping into the angel fiercely, forcing Balthazar deeper into his brother.
'Fuck!' Dean began moaning, writhing underneath the angel's erratic thrusts and one gentle hand around his cock. He whimpered and groaned as another set of fingers began to fondle his balls, and his shining green eyes locked on his brother, silently begging for more.
Balthazar thrust hard into the hunter, then shoved himself back onto Sam with a groan. His fingers clenched on Dean's shoulders, and he smiled as the man groaned and whimpered beneath him.
Sam's fingers stroked deftly at Dean's balls, feeling them draw up beneath his touch, thrusting his hips sharply into Balthazar as he felt himself prepare to come.
All three men moaned in unison as each came- Sam in Balthazar, Balthazar in Dean, and Dean on the hands of his brother and the angel.

Sam's eyes opened slowly, feeling hot breath against his back, and an arm around his waist gently. It felt good to be sleeping beside his brother again, now John wasn't there to tell them it was wrong.
Balthazar had left in a relative hurry, proclaiming that 'The evening was grand, we should do it again sometime, Darlings.', before vanishing before them, leaving the exhausted, spent Winchesters to recover and relive from the... Unique experience.