A quick Google Translate shows that Warspite's cosplay caught Valiant off guard and caused her to worry about creeps but Warspite responded, "Ah... it's okay, the admiral's with me," which only made Valiant's imagination about the admiral go buck wild. The last part is a result of either Rodney or Warspite claiming that he's out on a mission right now which causes Valiant to think that "he's" actually some kind of commando shipgirl.