"Tony?" Steve was a bit confused when Tony got behind him but then he was sliding into Pepper and oh god she was wet. He closed his eyes and keened softly, his head falling back onto Tony's shoulder as he slowly rolled his hips to push himself into Pepper, starting a slow thrusting rhythm. The man whimpered as he felt Tony's hand on his nipple and the other man's breath against his ear...
"Please." He whined, even though he had no idea what he was asking for as he continued to push himself into Pepper over and over again.