As a hello
Steve
Tony was bent over another piece of his suit. Music blaring as he worked, his lab otherwise empty. He was so focused that he did not see Steve walk in. Did not notice him standing behind him, a light smile on his face. The music was lowered and Steve sent a smile to the roof, a silent thankyou to Jarvis.
"Jarvis! What?" Tony began. He froze as arms wrapped around his waist.
"I love you." Whispered in his ear. Tony grinned before turning, meeting beautiful blue eyes.
"Hello to you too."
Tony
It was 3 AM. Tony was sitting in bed, a stark pad in his hands as he tiredly read reports. A thump from outside made him jump. The door slowly opened and a tired man walked in, his suit torn in places, his blond hair everywhere. He looked at Tony with a tired smile.
Tony could not help it, he stood and walked to Steve. He pressed a gentle kiss to his forehead, then his lips before saying gently "I love you."
"I'm home"