Bruce looks perfect like that, with his eyes glazed and his body splayed out for the taking. He probably doesn't realize how good he looks, which makes him all the more attractive, really, and Tony keeps rubbing them together in answer to his moans.

"You're going to let me fuck you?" Tony keeps their lips close so Bruce can feel them brush as he speaks. "Do you want to feel me inside you? I can always fuck you until you can't think of anything else."

He kisses him again deeply, jerking them both with his hand with a few firm pumps before he leans back again and grabs the abandoned lubricant.

"Well? Don't say it if you don't want it, big guy. We can wait if you wanna."