His throat feels thick at Tony's words, swollen by his attempts to suppress all the noises that he wants to make. Bruce keeps his gaze locked on Tony as he watches the other man move, his gut twisting itself into knots as he feels himself hanging over a metamorphical cliff as tension winds through his entire body.

"Sta--" he tries again, and this time he's cut off with a wholly involuntary moan when Tony moves in, pressing their cocks together. It's hot, too hot, too good, and Bruce shudders and moans again as he thrusts blindly against that heat, lost to it.

This time when Tony kisses him Bruce can't help but let him invade his mouth throughly. He belatedly realizes that he's actually grabbing Tony by his arms as his fingers curl into the sleeves of his shirt as he tries to hold on while he gives in to what his body wants as he tips over the cliff and going into freefall.