Claire isn't a nurse - she's pastor/priest/whatever and Matt meets her when he staggers into her (obv. not Catholic) church looking for a place to hide.

Once the danger passes, they get to talking, and he realizes that he's never been in such close proximity to a lady!priest, particularly not one who's so young and smart and obviously sexy.

Cue Matt being guilty and Catholic and wanting.

(idc if they fuck, I just want more of Matt's guilty boner in this world)