This is hawt, I think I might've discovered a new kink. I love Shion as a guy, I love him as a girl, I hope he keeps on switching from one to the other with more smut to come. And I stan Rui's bi, go for it, bro! ლ(´ڡ`ლ)
Also, please develop this into a romance and I hope they end up together with Shion as a guy since that's his true from. But for now, let's have fun with both.
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Fucked by My Best Friend