Today on 'The author's barely disguised fetish': "What exactly is even the fetish here?"
(meant as all of this can be seen either as some sort of fetish/kink or a plot device)
Putting the censorship aside (that'll take care of itself after vol 2 is released), Rui is the one who is in complete lust/love with Sara. She wants her (and has wanted her since before all this started) so bad it's not funny. Sara hadn't even thought about Rui until Rui started this whole thing. She's definitely along for the whole ride, now, tho.....