I think it'd be reassurance since they'd become 'one in body and soul', or whatever it was called again, so that other stone wouldn't affect them anymore
Yeah that's true. It won't effect either of them if they do have sex. But, I feel like after they have sex, Go Siwon will throw Kang Jinha away. I don't know why, but I just do. I know, he's not selfish to do a thing like that. But worst comes to worst, and Go Siwon refuses to see him because he is being "Unfair", I don't really know how to explain it. But hopefully, Go Siwon finds out the truth about his.... "Seonbae"
This isn't exactly reassurance.........also I think we all know that "sex = love" is a false argument.