Well, at least they both look like they are enjoying it, however, in Sakuya's case, it's that, and I swear, it's as if she's punishing Remilia or something. Will wait for the translations to be 100% sure.
All of a sudden I'm thinking that 4chan pic where Asuka is a futa, and is screwing Shinji from behind all the while saying "Baka shinji! This is how you fuck! This is how you fuck! Why can't you ever screw me like this?"