@The Silver Bard
There was an update recently, so here's some free advertising for that and also a small amount of feedback from a quick overview I did. I only made it to level 9, and I understand much of the new stuff in the past couple updates is more late-game, so this is hardly comprehensive, but it will get us started.
General
The patch notes are unclear, but I'm assuming the grudges are sequential here: Cassie doesn't seem to advance past her better-fitting-clothing benefit, no matter how many times she loses.
The button to check out the stats on your competition doesn't disappear after selecting it, so there's a chance the player can purchase it multiple times if they double-tap the hotkey or aren't paying attention. It would be a small UI improvement to remove it after the player has selected it.
Not a bug, but I have some minor continuity concerns about the watch scenes. Cassie, Mara, and Angel have their advanced attributes in the scenes even before they have them in the game-world, which is alarming/confusing if you're a new player who doesn't know about the advanced forms yet. As well, Jewel's watch scene says her clothes are ruined and she disappears after winning, except the game mechanics don't reflect this: both competitors can remain in the same area after their brawl, and Jewel's clothing state is whatever it was before the encounter. I don't know if you care about this level of detail, but I list it because it's good form for text-based games to keep what the player reads and what is happening in the game-world consistent.
There's something iffy about triggering some of the watch scenes. Sometimes, choosing to watch simply makes the game proceed as normal. It's super easy to find, but I don't know what causes it. I've seen it happen with Angel, Jewel, and Cassie, but I've also seen all of their scenes. Mara was never present when I was testing this, so I don't know about her.
In-combat
Neutral position: "You and Cassie circle each other cautiously" is missing a period.
Tie Guy-augmented Bind: "You catch both of Cassie hands" -> "Cassie's hands".
Tricky Strip Bottoms: Missing period at the end of the last sentence.
Scenes
Introduction to challenges: You usually treat Student Union as a proper name and capitalize it, but not at the start of this scene. Same thing whenever Lilly shows up ("You arrive at the student union with about 10 minutes to spare ...").
Cassie easy defeat: "... when she finally cries out in orgasm, you feel it as wet vibration against your palm." -> "a wet vibration" or "wet vibrations".
Mara easy defeat: "continuelicking," "andshe," "Youjust," "toshrug", "youpush", "happenagain""
Mara encountering naked PC: There's a comma splice here.
Aesop's techniques: "still be able access it" -> "still be able to access it"
Info on Cassie: 1) "This is apparently a matter of necessity for her, her family doesn't have a whole lot of money" is a comma splice. 2) There's a period instead of a comma immediately after the first paragraph. 3) "disappear to quickly" -> "disappear so quickly"
Info on Angel: This is just a couple minor quibbles about capitalization. Aesop says "mmmm..." as its own clause, which isn't capitalized. And he says: "Three words for you: Beautiful Blonde Nymphomaniac," which probably demands periods (or at least commas) between each item. I don't have a rule I could point you towards for this one, but that's my intuition.
Info on Mara: "on of the computer labs" -> "one of the computer labs"
There's a leftover placeholder in Jewel's watch scene: "[Opponent]".
Mara watch scene: The second to last paragraph begins with a comma splice and then an incomplete sentence. At the very end, it says the player continues "the game," which is something that has been capitalized every other time it has shown up. And finally: "Angelbegins".
Angel encounters PC while naked: "If you sit still an behave yourself" -> "and"
Mara after losing a few times: "going to well" -> "going too well"
Jewel's challenge: "your pants one" -> "your pants on"
Descriptions:
Quad room: Last sentence is a comma splice.
Fondle Breasts skill: "opponents breasts" -> "opponent's breasts"
Sensitivity Flask item/skill: "whats" -> "what's"
Masturbate skill: Mojo and arousal are not capitalized here.
Release skill: "return to neutral standing position" -> "return to a/the neutral standing position". When you say "return to neutral," it sounds like "neutral" is a proper noun, like it might be in a game like Tekken. If this is the case, you can simply capitalize it. This is also one of the only (the only?) descriptions that ends with a period.
Tricky Knee skill: "Knee Strike" -> "Knee strike"
Seduction attribute (when leveling up): "opponents arousal" -> "opponent's Arousal"
Power attribute (when leveling up): "stamina" -> "Stamina"
Personal Inertia trait: "status" -> "Status"
Amateur Magician trait: "slight of hand" -> "sleight of hand"