Anyone know what the triggers are for any alternate scenes?
For example if you click on her a number of times when she has high sensitivity she jumps your bones.
From what I've been able to unlock, you can raise her laundry skill to at least 10 for a total of 3 outfits you can buy off Prim and leave her alone for a couple of days with high sensitivity.
According to the True Ending credits blurb, that seems to be all of the extra scenes unless there's more variations with the masturbation scene. I tried buying another outfit to see if there were any changes, but it doesn't seem like it.
To be a little more precise:
Laundry Skill Lv. 3 --> Maid Outfit available in shop
Laundry Skill Lv. 6 --> Nurse Outfit available in shop
Laundry Skill Lv. 10 --> Swimsuit available in shop
Cleaning Skill Lv. 6 --> When you ejaculate during the Charm actions you will get to see a small window in the upper left corner where you see Saki's face (side view nose downwards, so no eyes) performing a "clean-up" on the MC's member before you continue the actions.
Btw. Cooking skill increases Saki's energy.
Lv. 3 = +10 -> 110
Lv. 6 = +20 -> 130
Lv. 10 = +30 -> 160
Also I am not sure if I remember this correctly but I think the Cooking skill also unlocked the part where the MC sucks on Saki's breast after fondling her chest till she orgasms. The action is taking place during charm sessions and shown in a window in the upper left corner just like all the other actions and the clean-up bonus from cleaning skill.
So that would allow one to make more actions during charm.
Also the items "Vital Up" and "Vital Up+" give a passive skill to her that should decrease her energy consumption when you penetrate her during charm actions. So buying each once and using them would also increase the actions you can do during a charm session.