Her secret guardian angel (Female)

You always kind of regretted drifting apart from Selina, not just because of how awkward things could get between the two of you in your shared art class. Selina was fun to be around! Never the most excitable person even before her new black-clad-stoic act, she had a witty sense of humor and was very generous with her time. Now, she mostly scowled, at least in your direction; however she really felt, she seemed to want to keep you at arms length. Already difficult to look her in the eye, it only became more difficult after a certain discovery you made, entirely by accident.

For a few weeks, your art class had been focusing on photography, and had students take whatever shots they liked over the weekend to discuss the next week. Your well-meaning but not-so-tech-savvy teacher needed a hand getting the everyone's shots onto her computer, either from emails they'd sent her or off of their SD cards, which is how you spent a Monday afternoon after school after she managed to bend your ear a bit. Most of the submissions were about what one would expect; some black and white shots of tall buildings, some close up nature photos, etc. You opened one email, noting that it was from Selina, which wasn't the most shocking thing to discover when you opened the attached photo of a raven sitting in a tree, or the one of the gates of the nearby cemetery. What did take you by surprise, so much so that you had to disguise a gasp as a quick cough to throw off the art teacher, were the contents of the third and fourth attachments. One was a black and white shot of Selina herself, in a pair of long, black stockings and black bra & panties combo seemingly straining at the seams. In the other, she was completely naked other than the stockings, kneeling on the floor with her back to the camera, showing off the flawlessly smooth skin of a round, plump ass you had no idea was under the baggy pants or long skirts she normally wore. Rapidly turning red, and strangling the guilty impulse to CC yourself, you copied the images she meant to send for her assignment, and deleted the email before the teacher could see what must have been accidental attachments. Waving off your teacher's concerns, you finished your task and hurried home, with a lot to think about.

Only, that wasn't the only time you wound up sparing Selina some exposure. Completely by coincidence, you found yourself in the same store at the mall. You were there to replace a few older, undersized pairs of underwear and a couple pairs of jeans, and wound up in the stall farthest to the back of their dressing room. You were just closing the door when you noticed one opening across and just ahead of you, and who would step out other than Selina; topless this time, with one arm held over her chest and barely keeping her tits from spilling out over them, and wearing nothing else besides a pair of skimpy black bottoms. Your heart skipped a beat as you watched through the tiniest sliver of your stall door, and you felt dirty as Selina, trembling slightly, turned to look at herself in her stall's mirror. Nearly taken aback (it turns out those black bottoms were in fact a thong, and she was unknowingly mooning you with a perfect view) you only just noticed a shadow to your right; there was a woman in the stall next to yours, right across from Selina, and she was moving to the door! You slammed your door shut, making sure Selina could hear it; Selina must have gotten herself out of view in time, because the woman to your right didn't stop or make any noise as she continued out of the changing room. A few minutes later, you hear Selina open her stall and walk out as well, heavy boots stomping swiftly out of the store.

In short, you're two-for-two on stumbling on Selina pulling some accidental exposure or exhibitionist stunt, and you've managed to save her (shapely, bouncy, near fully exposed) ass on both occasions, without her ever even knowing. The part of you that isn't vaguely excited by the whole thing hopes that karma will give you a break for your good deeds; that you can go back to mildly awkward acquaintances without catching another eyeful. Of course, that isn't about to happen: it's only going to escalate from here. Whether Selina finally catches you catching her and keeping her concealed, or you get caught up in her exhibitionist antics willingly or not, or somehow roles completely reverse and Selina finds you bare naked and with your fate in her hands, some quirk of fate was going to keep pushing you two together with less than a full two sets of clothes between you.