Late reply. sorry. but here you go. Hopefully this will help a little. Bonus and mini scenes do happen randomly if you don't have the free explore enabled. If you do use free explore, they can all be found on the overworld. And if you miss something and really want to see it you can always choose it from the scene picker ^^

Bonus Scenes

• 101 - Atti (with Atti lewd scene) - occurs after 17.1
• 102 - A performance not to forget (with Angel lewd scene) - occurs after 9.3
• 103 - Mshen (with Mshen lewd scene) - occurs after 7.4
• 104 - Zion (with Zion lewd scene) - occurs after 16.3
• 105 - Heretic (with Nava lewd scene) - occurs after 16.3
• 106 - Forced (with rickon lewd scene) - occurs after 4.6
• 108 - The raptor (with Jane lewd scene) - Occurs after 3.1
• 109 - Click (with click lewd scene) - Occurs after 16.3

Mini Scenes

• 201 - Species Guide - Occurs after scene 1.1
• 202 - Izzy's Diary - Occurs before 20.1
• 203 - World map - Occurs after 1.4
• 204 - Io's Performance - Occurs after 2.1
• 205 - Click - Occurs after 4.1
• 206 - Chef - Occurs after 2.1 or 4.1 or 7.4
• 207 - The Storm - Occurs before 20.1