There's definitely a version of 18+ sour luka out there somewhere. According to a linked video it was an edit by "Mickel".
Anyone know where to find an ecchi version of sour luka? Something like in these videos:

https://ecchi.iwara.tv/videos/vqgzrtjweteggvwg
https://ecchi.iwara.tv/videos/m87rgs5yls2ynozk