Sex Pollen Warning but they are kinda into it as well as  minimal wincest warning

Sam, Dean, and Cas were on a hunt, it was an odd hunt because rather than everyone just straight up dying people were often found within the woods having had wild orgies and while some people end up dead during the middle of it due to the exhaustion and or pure lust kills. They were trekking through the woods when Castiel noticed some odd plants on the ground shaped rather phallic.

"I think I found the issue."

Dean and Sam got closer only to be sprayed in the face by an odd yellow pollen that shot from the top of the plant, Dean began to cough and the plants began to spray out more pollen. Castiel was soon struck by the same odd yellow pollen and stumbled back trying to avoid any more but it was far too late for all three men. Dean felt hot, his clothes were beginning to constrict him, wordlessly he was undressing himself.

Sam's brain was fuzzy, any logic he thought he could provide was dwindling away. Castiel's eyes were trained on Dean who now stood naked in the middle of the woods, the angel too was soon naked and unafraid to show his true feelings for his human companion. Sam blushed as he watched Castiel and Dean grow entangled, his brother was moaning loudly as he was slammed into the nearest tree and Castiel was soon on his knees sucking Dean off.

Soon Sam felt the desire to undress and join them, his cock was much thicker and longer than his brothers but that didn't stop Castiel as he was soon sucking them both off going back and forth between a thorough hand job and bobbing his head on the opposite brother's cock. Sam's head reared back as he steadied himself by holding onto Dean who let out a soft moan at the touch of his brother. Both Winchesters were unaware of how intense the pollen truly was. Dean grunted as Sam began to play with his nipples. Castiel continued to jerk and suck the boys off before Dean pulled away from his brother and took Castiel by the hand before pinning him down to the ground and forcing his head against the grass. Castiel yelped as he felt Dean begin to lick his entrance. "Mine." Dean mumbled as he continued to eat him out.

Eyeing the plants that did this to them Sam headed towards them to investigate. In a haze of uncertainty he began to lower himself on top of the odd green plant. Sam let out a soft moan in surprise as he felt the plant enlarge within him. Sam began to ride the plant while watching his brother touch Castiel lewdly. Cas groaned and cried in pleasure as he began to jerk him off while continuing to wet his entrance.

Castiel gripped the grass between his fingers tightly letting out soft moans and cries while Dean continued to toy with him before pulling himself up off the ground and lining his cock with Castiel's wet ass. Spreading his cheeks Dean sank inside with a happy moan before he began to thrust deep inside him. Sam groaned as he continued to fuck himself on the phallic shaped plants.

Castiel whined as Dean gripped his hips tightly before they both had an idea. Dean pulled out of Castiel for only a moment and dragged him towards Sam before sinking himself back into the angel. Castiel began to suck Sam off while he fucked himself on the plants.

"Ah fuck.. Fuck.. ah.." Sam moaned loudly as he continued to slam himself down on top of the large plants that seemed to grow in size inside him.

Dean continued to slam deep inside Castiel as Sam held Castiel's head down over his cock while he continued to ride the plants while also rutting his hips into the angel's mouth. Both Winchesters continued to penetrate the moaning angel.

"Ah.. fuck.. Ah.." Dean grunted before filling Castiel with a round of cum. Dean began to groan as he fucked him roughly cum dripping out of his entrance. Sam yelped as he felt the plant begin to penetrate him rather then him need to fuck himself on it.

He came and Castiel swallowed it down happily. "Fuck.." Dean groaned as he slammed Castiel down on his cock, Castiel pulled away and soon was back on top of his cock straddling the elder Winchester while kissing Dean roughly. Sam managed to pull himself off the plants and lined himself up to join Dean inside Castiel. The two men continued to ravage him, filling him up with their large cocks.

They were moaning and panting while fucking Castiel roughly, the angel moaned happily taking their cocks. Their kisses were rough and Sam was suckling at his neck.

They continued to fuck for what seemed like hours before the three men passed out, the phallic looking plants continued to puff pollen into the air waiting for them to wake.