[ He'd been making a joke, but the raised hands make him pause, realizing that it could have been construed as making fun of Matt rather than just gently teasing over the term. ]

No, sorry, I-- normally, if someone offers to 'wash your back' it's like a...

[ Wait, is it not for some people? Shiro trails off, rubbing the back of his neck. Whenever he'd offered, it'd been a sort of joke, because it wasn't like him and his partner were going to get too much actual washing done. He's actually relatively certain this is the first time that he's ever showered with someone without doing anything else, though it's not that he's showered with a lot of folks, either. ]

Usually it's like a wink-wink kind of thing, you know? Sorry, I didn't mean anything by it.