Okay quick authors note: here's the twister mat I'm going off of, it's pretty standard, also I think it might help you understand.
Green-Yellow-Blue-Red
Also, you might've seen the picture I based this fic off of, but if you haven't you need to look it up because it is absolutely adorable.
When the boys have nothing to do Sam brings out a game of Twister. Of course cute shenanigans are ensued and Sam is left uncomfortable, as he usually is when witnessing sexual tension between Dean and Cas.
Twister (sex in a box)
Cas, Dean, and Sam sat at a library table in the bunker. Sam stared at his computer, often scrolling to read further down in whatever it was that had him so interested. Dean looked at a large book labelled "Demonic Thesaurus Volume 7", but it was pretty clear that he'd stopped reading long ago as he hadn't turned a page in over 30 minutes. And Cas? Well Cas was playing with his new Emoticons. Dean and Sam's phones would often buzz and beep as Cas sent out another one. The first couple of times Cas sent one to Sam he would check it smile and then go back to what he was reading, but after the fifth one he didn't check anymore. But Dean checked every one, looking at the different faces Cas would send, but never replied or had a reaction.
Finally after an hour Sam shut his laptop and then looked at the two men across from him, "I'm bored."
Dean glanced up, "That's great Sam." He mocked, and then looked back down.
Sam shifted in his chair, disregarding his brother's rude comment, "You know," He sighed, "I saw Twister in one of the rooms in the basement."
Dean looked up, extremely confused, "They have Twister in this museum?"
"Yeah, it's pretty old though." Sam replied shrugging.
Cas looked up from his cell phone, "What is Twister, a movie?" He asked.
"No, Cas, it's a game." Dean answered, looking back at his Demonic Thesaurus.
Cas nodded slowly, "I haven't played many games before… Is this a board game like Sorry?"
Sam leaned forwards, clasping his hands together on the table, "Uh, no, this one's different. This one is more… Physical."
"Can we play it?" Cas asked, looking at the brothers.
Dean rolled his eyes and looked at Cas, "The game is for kids Cas, you don't want to play it."
"I was told that Sorry was for kids as well, but I thoroughly enjoyed playing it with the other patients." Cas pointed out.
"Yeah, but you were mental then, that doesn't count." Dean shrugged.
Cas squinted his eyes, "I don't see why that matters?"
"I say we try it." Sam cut in, standing from his chair and walking out of the room.
Cas watched him leave, and then turned to Dean, "What does Sam mean by 'physical'?"
Dean looked over at Cas and sighed at having to be the one to explain it, "Okay, I'm going to give you the run down on how to play Twister, so pay attention."
Cas nodded, leaning forwards in anticipation.
Dean took in a deep breath, "To play Twister you have to have at least two players, one to spin a spinner, and another to complete the actions the other person tells them to do. The things that you need to play it come in the box and it's a mat with I think four rows of different colors on it, and a spinner with a color and a body part on each spinner option. So the person spinning spins the little spinner clock thing, and when it lands on an option they say the option, like 'right hand – red' and the person or people playing have to do the action by putting their right hand on a red dot."
Cas blinked.
Dean pursed his lips and sighed, "You'll probably get it better once we play."
"Okay," Cas nodded.
Sam walked back in with a dusty old twister mat, "Look at this relic." He chuckled, turning it over in his hands.
"Yeah yeah," Dean muttered, "hurry up so we can get this over with."
Sam chuckled again and set down the box in an open space in the library, "The game will require you to get out of your seat Dean."
"Who says I can't spin?" Dean shot as he stood up and walked over to where Sam was.
"Because I'm going to." Sam stated plainly.
Dean groaned as he sat down, "Why should you get to?"
"Because I found it." Sam argued, opening the box and emptying it of its contents.
Cas stood slowly and walked over to them, observing the items that Dean had described earlier. He was right; there was a plastic mat that had four rows of colors, each row a different color. And there was also a spinner that had all of the colors on it in four different sections, each section either labeled, right hand, left hand, left foot, or right foot with a spinner in the middle. "This looks simple enough." Cas said as he walked up and sat down.
"Oh, it is." Sam smiled, looking up at Dean and Cas mischievously, "You know," he drawled as he unfolded the dusty mat, "this game was nicknamed sex in a box back in the day."
Dean clenched his jaw and looked at Sam and then the game, turning bright red.
Cas looked at the game, "Yes, now I remember," He said, "It was called this after they played it on the Jimmy Carson show. Also... I think I've played this before."
Sam laughed, "There you go; now you're not as lost."
Cas nodded, "It seems the game slipped my memory."
"Whatever." Dean muttered, "Could you move any slower?" He whined sarcastically.
Sam glanced up at Dean from putting the spinner together, "If I tried, yeah." Shortly after he had everything set up and told Dean and Cas to stand up. "Okay," he mumbled as he spun the spinner on the floor, "right foot blue."
Dean sighed, "Here we go." He muttered as he stomped his foot down on one of the blue circles.
Sam spun again, "Left foot red."
"Easy enough." Dean sighed, putting his foot on one of the red circles in the row next to the blue row on the outside of the mat.
"Okay," Sam mumbled as he spun again, "Right hand green."
Cas looked behind him to see the green row was on the opposite side of the mat and directly behind him, so he improvise, turning his body awkwardly and putting his hand on a green circle. While Dean leaned forwards and put his hand on one, ending up kind of close to Cas, but not too close, I mean, neither one of them cared too much about the other's personal space, so this was no big change.
"Uh…" Sam giggled as he looked at the spinner, "Left hand green."
Dean looked at Cas. His right hand was on the very end of the row with Cas's had in the circle next to his. "Okay…" He mumbled as he put his arm over Cas – who put his left hand at the other end of the circles – and twist his leg under Cas's so he could hold himself up.
"I think I understand why this was called such an inappropriate name." Cas said quietly so only Dean could hear, as he looked at Dean's position.
Dean looked at himself, Cas was literally between his legs, and Dean was standing on the balls of his feet and hands directly below him at Cas, who was looking up at him red faced.
"Right foot red."
Dean looked down, surveying his situation. He already had one foot on red which was on the outside of the mat, and his hands on the green which were on the other end of the mat, and his stomach was towards the floor. And Castiel was directly beneath him, with his hands and feet on the circles in between Dean, and his back to the floor.
Cas easily moved his other foot to the green circle, and so did Dean, but in the process of moving Cas lifted himself slightly, touching his hips to Deans.
Dean immediately turned beat red and his right foot slipped as he tried to adjust, causing his left one to slip as well. He fell down onto Cas, his face buried in the crook of Cas's neck.
"I think you lost Dean." Sam laughed. Dean could tell Sam was getting a real good chuckle out of this, but Dean's heart was pounding, and his skin was as hot as hell, and he'd know what that feels like.
"Dean?" Cas's deep voice said quietly in his ear, "Are you okay?"
Dean's breath hitch and his heart skipped a beat, "Uh, y-yeah Cas! I'm fine!" He stuttered, staring wide eyed at the mat.
"Okay," Cas said doubtfully.
Dean blinked and tried to move, but his body had shut down, he was completely frozen. He could faintly hear Sam losing it off to his left, but the loudest thing was Castiel's equally fast heartbeat.
The next thing Dean knew Cas bent his arms to lower himself away from Dean, but, since Dean was resting on him, he just went down with him.
"Um, Dean?" Cas's voice wavered slightly.
"Yeah?" Dean squeaked, not really moving.
Cas turned his head. But that didn't help at all, as Cas's scruff brushed the back of Dean's neck sending more chills through his body, causing his elbows to give out, making him collapse completely on top of Cas.
Cas gasped, but didn't move to stop him or push him away.
"Whoa," Sam chuckled, covering his eyes, "keep the PDA to yourselves."
Dean smirked and looked at Sam, "This is for not letting me spin." And turned his head slightly to kiss Cas softly.
"Gah!" Sam exclaimed, falling backwards, "I'm going to my room, it reeks of testosterone in here."
Cas expected Dean to pull away as soon as Sam left, but he didn't, instead he just kissed him more deeply, moving his hands to go under Cas's upper back. A low sound escaped Cas as Dean kissed him, and he moved his hands up to Dean's spiky soft hair, running his hands through it.
Dean pulled back not too soon after, and looked down at Cas, "I've been meaning to do that for a while."
"I'm glad you did." Cas replied quietly, looking at Dean's eyes, then lips, then eyes again.
Dean let out a short breath, smiled, then kissed Cas again.
And when they pulled away for air, Cas only had one thing to say, "Remind me to thank Sam for not letting you spin."
- Thanks for reading - ER
