Trying to belittling me will not push your point, you know. I'm 42, I've had my fair share of experiences

just not with sisters, but honestly, I wouldn't have minded one bit if those girls were siblings or not.
See, I'm not against that, like at all, but Iris really is into Erynn, she said it herself. And of course it all depends IF both are stepsisters, something that some people, like myself, just assumes for now. If they're not, who knows, could happen, but there hasn't been any threesomes at all either so far, doesn't mean it won't happen, doesn't mean Erynn is or isn't into that, she doesn't strike me as one who would want that, she's just lovestruck with the MC, don't think she'd want to share him, but whatever, who knows.
And Patreon being what it is, the slightest mention of incest could compromise her account, and she'd had to work a lot just to create patches, we're in the 9th chapter, and no sister-sister or mother-son or mother-daughter or father-daughter happened, doubtful it will happen anytime soon.
That was my angle, Patreon is a bitch.