Pandora with today's prompt: nicknames. In this Yuri is recently 18 and JJ is 21.
Aside from the obvious, Yuri can never seem to make any nicknames stick on JJ. Every one rolls off him like water off a duck's back. 'JJ', Yuri realises, is the default for a reason: 'Jean-Jacques' is too long, too formal, but he is neither name alone and each sounds incomplete without the other. All this combined with Yuri's general distaste towards cutesy pet-names means the only other thing he regularly calls JJ is 'Shithead' – a name he says with less and less venom as months go by.
By contrast, Yuri's list of nicknames grows ever longer. He's been 'Yurotchka' since before he knew what his actual name was, and 'Yurio' seems to annoyingly be becoming more and more popular with the people he sees regularly (thanks a lot Viktor). He is 'ice tiger', 'fairy', 'punk', every new name joining the others, and he's sure still more people have called him things of which he's not even aware.
When he was younger, JJ called him 'little Yuri', but now he seems to have settled on 'kitten' – to the point that he sometimes rarely uses Yuri's actual name. Generally, Yuri doesn't mind it (not from him, he eventually realises), sometimes he brushes it off in irritation, but now (but now), with JJ murmuring it into his ear and his tanned hands warm on Yuri's pale skin, Yuri practically lives up to it with the purr that leaves him. Yuri's hand tangles in the longer hair at the back of JJ's head and he enjoys the vibrating rumble of JJ's answering groan against his back. JJ bites down on his shoulder and Yuri gasps, even as JJ's hand on his cock speeds up.
"You like that kitten?" The words are met with a strangled noise and JJ's teeth scrape against Yuri's earlobe.
Yuri shudders and gasps out, "JJ – oh fuck!"
JJ lets out a low groan at the need in Yuri's voice. "Cum for me kitten."
Yuri does so, mouth dropping open with a final cry, JJ following soon after, keeping up his pace to make sure they both ride it out completely. Afterwards, he pulls out and takes Yuri by the hand to the bathroom to clean up. Yuri perches on the edge of the bath while JJ runs a flannel under the hot tap. He's staring off into space when–
"Yuri."
He looks up, confused, worried – JJ so rarely calls him that.
"I love you."
Yuri's fists clench and he feels the hot prickle of tears behind his eyes because JJ's never said that before and Yuri's heart feels full to bursting.
"I – I love you too," he chokes out, and next thing he knows JJ's arms are around him and he's letting those tears roll down his face.