
Ik first and foremost this counts as incest however I would like everyone to keep in mind that regardless of the current situation Ruby still remembers a time where she wasn’t siblings with Aqua, and when she didn’t know who he was before she was not interested in the slightest. It’s the fact that she knows someone else is in there that she’s considering this shit. It’s no less disgusting but I can understand the mindset. I don’t condone but I do understand.

If there is no age stated then just assume they're of age till proven otherwise. I'm going to assume that Mr. Blackhaired top was at least 18, and if we go by how Korean age calanders probably 19. There's no reason to assume the worst especially when there's no power dynamic problem involving their age gap. If it does come up later and the age gao is cringe then, yes, bug out. But we're not in a position that we need to.
The ML's face be facin and if that's all it takes for the MC to swoon ig it's over for her.