Promising setting in a massage parlor (MP) with all sorts of possibilities of get-to-know-you, seduce-your-MPA-for-more, going from innocent to risque, as men "obviously" get massages for the quality massage. Rushed too quickly to somehow live in the house with the girls.
Ideally could develop more in the MP. Trying out each of the girls, learning more about each girl, the group (the spa), and services available. Uncovering clues in the spa, while robberies continue. Sharing more of the spa world, of releases available in a bodyrub: HJs, LFK, DFK, DATY, 69, BS, PS, CBJs, BBBJ, BBBJCIMS, all the way to FS, and even BBFS. All the while being told, you're the only one getting this. Growing trust and relationship with each of the girls, with some tougher to unlock than others. Potential audio of other rooms (creaking tables, rhythmic pounding, moans, etc.), so MC knows that more than massages are available. Girls who are popular offer more services. Using gov't money and being funded by the FBI to get off, as they need more evidence, female FBI agent acting like a sugar mommy, all in the name of being thorough, and solving these heinous bank robberies - uncle Sam is always willing to fund justice. Getting further with each of the girls, that when a search for more clues at their house does happen, it makes more sense why they don't kill him.
Ideally develop more with the female FBI agent, with more flirtation, tension, and passive-agression, so when the release does happen, it's more satisfying. When the MC's escapades are shared as he has to report every detail to her, and what occurs, she finds herself wanting to experience it, but knows that a prim and proper FBI agent would never cross the line, or will she? Playing good cop, bad cop, mock arrest with use of handcuffs, and erotic interrogation techniques of denial/release guaranteed to make anyone talk.