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Fergus spreads his fingers, and it's so good that Adam chokes out a delighted laugh against the duvet. He's not sure if he's glad or not that his hands are still tied. If they were free he'd definitely have orgasmed by now.
But restrained he's forced to enjoy how much Fergus loves to edge him. Fergus reaches under him with his other hand and wraps it loosely around Adam's cock. Adam doesn't know whether he wants to thrust into Fergus's grip, or push back against his fingers.
Fergus strokes him steadily, inside and out, until he's a begging mess on the bed. He can feel his orgasm building and he tries not to let on, but Fergus can feel the tension in his body around his fingers and he moves his hand to squeeze firmly just below the head of Adam's cock, staving off the sensation.
"Fuck!" Adam groans in frustration but Fergus just continues working diligently to stretch him out.
"Do you want to know why I'm edging you?"
Adam turns his head so he can try to look at Fergus, who looks the picture of smug, just as Adam had expected.
"Because you're a fucking sadist?" Adam replies, his tone, aiming for annoyed, more than a little tinged with adoration.
"Mmmm," Fergus agrees, "Only when it comes to things I know you're going to enjoy."
Fergus twists his fingers, rubbing intentionally against Adam's prostate before removing his fingers completely.
"And it's not just that," he moves behind Adam and spreads him, pushing just the tip inside Adam, "I never said I was going to fuck you with my cock, did I? I want to fuck you with my fist, and I need you really relaxed for that. The more I edge you, the more intense the orgasm. But I also want to see if you can come from this, just the tip pressed inside you—" Fergus cuts off with a gasp as he starts to stroke himself, "It's enough that you can feel the stretch, but I want to find out if it's enough to make you come untouched. But either way, I'm coming inside you like this."
However well Fergus had stretched Adam before pressing in, Adam is still tight around him. This first press in is one of Fergus's favourite parts, so getting to just stay like this as he gets himself off feels fucking amazing.
Adam can only whine, his eyes squeezed shut as he lets Fergus use his body. He can feel him pressed inside him, the stretch just as Fergus described; enough for him to feel it, but he doesn't think it's enough to make him come. Fergus's strokes get faster and firmer, the closer he gets, and the stretch gets more noticeable the less carefully he moves. It's that little flare of pain, and the knowledge that Fergus will come like this regardless of whether Adam comes or not, which makes him think maybe he is wrong.
His orgasm takes him by surprise, at no point up until it actually happens believing that he could come just from this. Fergus has edged him so well that despite Adam's earlier orgasm and the lack of contact against his cock, it's intense and Fergus has to grip his hips to stop him collapsing completely.
Fergus groans as Adam tightens even more around him and spills inside him, pushing as deeply as he can without properly fucking Adam. Fergus holds his cock inside him, letting the last twitches subside before he pulls away, surveying the mess he's made of Adam.
He gets off the bed and walks round to untie Adam's arms. Adam turns his head, looking boneless and relaxed. "I thought you said something about fisting?"
Fergus grins at him. "I did, but I don't need you tied up for that," he says, checking Adam's wrists for any redness where the ropes have been tied.