Ji-hwan's introduction to Eun-hye of his sex house and his sex slaves.
Separate sex scenes:
Ji-hwan x Yura (chap. 86 only)
Ji-hwan x Minji (chap. 87 only)
The Epilogue/Review Chapter: MC having sex with the four women for the final time (albeit NOT a foursome and is portrayed as a storyboard than the actual pornhwa)