Thank you for the quick reply (wasn't really expecting it

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I was also going to mention that you could (potentially) find out each girls hidden secrets/fetishes (like the first story with the boss's SM thing).
1) You could use it to either black mail them when you're not invisible
ex:
The main character walks up to her while she's conversing with friends, and tries to say hello.
She looks at him with distaste, and says "go away loser.."
He replies "Neighbors' dog..."
She suddenly stops talking with her friends with a shocked look, her friends are somewhat confused and look at her, "What's he talking about?"
She says, "N...Nothing..." And walks away dragging the main character with her to another place (alone), and says "How do you know I accidentally let my neighbor's dog out!?"
"It doesn't matter how I know, all that matter is it will be a very bad deal if anyone else knows..."
She sighs heavily, looking into the characters eyes with fear and anger. Nearly trembling, and pale she hesitantly speaks "W...What do I have to do... to k-keep this between us..?"
(I know, lame example, I cant think of anything else right now.

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Or 2)
When you figure out their darkest fetishes/ dreams (like I mentioned earlier, like that one girl with the SM in the first story) then when you start to 'trap' or 'take advantage' of them when you're invisible, doing the right stimuli of what they like they'll be less likely to call out for help and run but more likely to go with it (ex: oral, breast massage, foot massage, or role play, etc). You'll figure out the type of thing they're into the most by listening in to their personal conversations, or watching what they do on their down time.
EDIT: Reduced redundancy.