[He should feel ridiculous for how his chest twists, how his heartbeat's kicked up in a way that's entirely to blame on Shiro calling him that again, on his words, his touch, all drawing an abrupt hitch at the back of his throat - but paired with the way he lifts his child when that touch trails down his neck, well. It's clearly not a complaint.]
Me too. Me too. [It's undeniable, a core part of his very being, to feel this way about him too, to say it back in answer, emphatically.] I love you.