It’s a HUGE thing in porn too. It’s like the taboo, people want what they can’t have. It def is strange, I could understand meeting as adults and falling in love, but growing up... kinda yikes.
Like the other person said, it's taboo and the thought of a forbidden love excites and incites curiousity in people. It's out there in any kinds of fiction, not only in porn and yaoi. It's fine as long as it's not taboo taboo, or you know illegal. And it's not incest. Others are even fine with cousin love. Mostly it's called a taboo, well because of tradition and genetics. Not saying I'm fine with it though, mostly because of genetics.
Ok but like why is step siblings such an a ok thing in yaoi, it weirds me out it always has maybe because i have step siblings im close to