God, but he loves the way Tony can lose himself so shamelessly to all of this. His eyes are still on him because to look away seems like a waste of the display he's getting now. He feels hemmed in by Tony on all sides, but instead of feeling as if he's suffocating, it's amazing; he's immersed in Tony and the lust he's putting off, and he doesn't feel lost at all. Tony grounds him.

"I am going to hold back." His voice is thick and heavy, full up of the want that he's holding back otherwise; it has to find somewhere to tumble out, after all, and it finds an outlet there and in his eyes. His gaze is still steady, still unwavering and fearless in its directness, slowly burning up with a hunger. See, Bruce is keeping the other guy at bay, but when pushed to the edge like this, when invited to let his more primal urges come out, there's something predatory about him, fierce and unrelenting.

"I'll hold back until you really can't take it." He's surprised at his own daring, but he's comfortable with Tony, and the hand working its way up his thigh gives him the confidence he needs. When Tony touches him, his eyes flutter shut and his mouth parts, half a gasp caught in his throat. He wants to push up into that hand, but his first impulse is to self-deny, so he forces his eyes open again, locking them onto Tony's. He palms the length of his cock through the fabric once more before he finally touches him, skin-to-skin, though still probably not what Tony's looking for. He strokes his thumb firmly up the underside, and teases his fingers against the head, toying with him rather than touching him in any real way.

"How long do you think that'll take, Tony?" he murmurs, composure back.