As someone who has only written dirty and nasty first time sex for them... they would be so soft but also competitive and argumentative.
Jon has an intense look of concentration the whole time as he struggles not to use his powers, and when Damian notices he forces him to let go.
"You're holding back," Damian would say, accusingly as he glared at Jon whose brows were furrowed, muscles tight.
"I'm not- Ah- I'm-" Jon is steadily losing control, if not for the fact that he is with the love of his life then because this is Damian the most beautiful person in the world, whose body seems made for his pleasure just as much as it is made for battle.
"You are! I'm not made of glass, Jon," Damian is filled up to his throat and is still ready to stop this whole thing just to argue with Jon. His toes have been curled for the past hour, and his body feels like it has a million supernovas going off inside of him, but the pained look on Jon's face and the thought of him holding back to focus on Damian... he can't have that, this needs to be good, this needs to be good for both of them.
Jon loses focus for a second and suddenly every puff of breath leaves tiny crystallised snowflakes on Damian's skin, and his hands vibrate where they're holding on to Damian's waist at a frequency that is superhuman.
That's when Damian realises what Jon has been holding back. How Jon is high from pleasure and is losing control of the very thing he has had to keep a lid on since childhood.
It's a power trip, and before long he is doing everything in his power to make Jon lose control even more: clenching, thrusting back, being more vocal.
All of it drives Jon crazy and it's not long before they're floating off the bed, Jon covering Damian with his whole body so that every time they bump into the ceiling he is safe.
"I love you," Damian whispers into Jon's ear, his mind is blank and they're the only words he seems to be able to grasp onto. This isn't the first time he has said it, probably not even the hundredth time, but it still makes Jon short-circuit. Filling up the condom and slamming his back into the ceiling so dust comes down around them, painting Damian's chest with snowflakes that melt almost immediately, hands sparking with electricity as Damian tumbles over the edge with him.
It takes a while for Jon to calm down enough to land on the bed—dusty now from the amount of times Jon has bumped into the ceiling—but when they hit the bed he immediately curls around Damian, nose in Damian's hair as he fills himself with Damian, who is no better, tangling their legs together and pressing his ear to Jon's chest so he can hear the galloping of his heart.