In a way Silksong already fills that itch but I certainly understand you

Make a metroidvania that it really makes you question if its actually endless

Nice! Haven't been able to get a grip on the basic Harrowick lore like why everyone's a candle, this would be great place to start!

Bretta has a very hard time saying 'no' to things and obeys without much question. From normal like "can I have a slice of your cake" to horny "show me your cock"

Molly has no such problem, she's just horny that she'll go along with anything. Shay is more reserved but she'll try anything once.