nah she doesn't have the usual "landlady and roomate" type stuff and she doesn't live in the same house, however she and the mc grew up together and u can choose her relation at the start so i was wondering if she's meant to be something specific or if it's vague on purpose.
It's deliberately vague because of Patreon rules.
They can be siblings if their parents died and they were raised in separate homes by different surrogate parents. For instance, Aunt Janice is not his real aunt, but his foster mother, and Clarissa was adopted. Easy.
Or you could make them cousins easily, if sibling incest is too strong for you.
But they can also just be childhood friends, if you don't like incest at all.
Every player's choice.