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increase excitement level (use jack off option) works for me 

First, don't equip Saint Maiden's Mercy in gear, second, just peep and tease your sis (on the left corner, there is a health bar, next right is the status, point to it to see how many % of your excitement, about 10% up is okay; if you have something like sage mode, unfortunately, you won't wake up. cause your exitement will be at -10%) until you wake up at night.