There's enough and there's too far, and most people clearly cut the two. Tony is not most people. It fact, Tony is pretty far from most people. When Bruce tugs his head up, he's already going for a kiss. This time it's hot and a little rough, but still not surprises because this is what Bruce wants. He's more than happy to oblige.

He grinds against him again, hips rolling, and it's filthy. He's done a lot of passionate things and this is up there on the list. A heavy dose of foreplay with Tony's hands braced against the wall and his tongue shoved into Bruce's mouth with a moan to match the heat of the moment. If he doesn't bruise his lips, he'll actually be disappointed. One hand slips from the wall and moves down between them, groping eagerly at the front of his partner's pants. He's not rushing too much--yet--but he's not going to keep his hands to himself.