She's trying to pretend she doesn't remember him (look at her expression: she's looking away, clearing her throat, stuttering over her first word), but she accidentally shows that to be a lie by using his full name when he only gave her his last.
This chapter is not uncensored in the manga volume release. Its sad but im assuming the manga company is preventing the artist from doing full fanservice. I just hope we get a director's cut/version on his fanbox one day