"If you understand, we don't need to talk about it." Bruce will trust him. It's possibly obvious he doesn't want to talk about it, as well, so that's a thing. He gives Clark an answering gentle kiss. "Do you want to sit down?" Since Clark made coffee, Bruce is going to grab some (maybe a lemon bar), but the idea of curling up with him is certainly appealing. If Clark wants to rub the tension out of his back, he's not going to complain.