3rd person POV (I'm best at writing in 3rd person so expect a lot of that)
Fell and Swap were cuddling peacefully under their blankets. They weren't asleep,but had their eyes closed. They moved around though, and occasionally mumbled a small 'I love you' or something sweet. Slim and Blue were also cuddling happily, enjoy the rare amount of peace in the normally noisy house.
In their room, Fell purred softly as he moved closer to Swap, nuzzling against his chest and letting out small squeaks as Swap gently kissed his neck, knowing how sensitive it was. He gently rubbed Fell's hips, which he knew Fell enjoyed. Fell smiled softly and let out a happy purr, moving his hips around in Swap's hands. Swap started to slowly move his hands up Fell's shirt, running his hands over Fell's scarred ribs gingerly. He gave Fell a sympathetic smile as he heard him whimper, gently kissing him to distract from it. The distraction worked, and Swap began to slowly undress Fell. He started with his shirt, gently pulling it over his head and leaning down, very lightly kissing his ribs as he pulled off his shorts and underwear. Fell blushed and smiled shyly as Swap quietly asked "has anyone ever told you how beautiful you are..?" before gently kissing him. Fell was absolutely melting at all this attention, and Swap could tell. He sat up, starting to slowly take his own clothes off, deliberately teasing Fell. Fell grumbled and glared at him, but eventually he finished, and gently flipped him onto his stomach, holding him close and gently nipping at his neck as he began to rut against him. Fell purred and moaned softly, visibly relaxing at how gentle he was being. Swap lightly smiled at how much Fell was enjoying himself, gently kissing his neck as he he slipped into him with a small shudder. Fell let out a slight hiss of pain, but Swap let him adjust, lovingly beginning to carress his hips. Eventually, Fell relaxed, and quietly told him he could move. Swap nodded and gently turned Fell to face him, gripping him closely and kissing him as he began to carefully move in and out of Fell. Fell let out a quiet moan, arching his back and nuzzling into Swap's chest. Swap held him, gently rubbing his back as he kept going, quietly telling him how well he was doing or how much he loved him. Fell however, was a mess. He had his back arched, gripping Swap tightly and moaning louder with each well-placed thrust. Swap began to nuzzle gently against the crook of his neck, kissing and biting it gently as he continued mumbling reassuring things to him. Fell started to calm down a bit, nuzzling into his chest. Swap held him, kissing the top of his skull as he took hold of his hips, rubbing them as he heard Fell's quiet voice ask him to go faster. Swap nodded and lifted Fell's hips up, pushing them back down again again as he thrusted in. Fell arched his back further and moaned, so Swap did it again. he kept doing it, slowly picking up the pace before Fell let out a squeak and came. Swap thrusted in and out a few more times before he came too. He let Fell have a small break before he gently pulled out and wrapped Fell in his hoodie, holding him close as they drifted off to sleep.