Is there a walkthrough for thia yet ?
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The game is linear, is there any particular area you're having trouble with?
For the minigames, remember to read Lily's advice at the end! Most of the time she has information on anything in particular that's new with a girl's minigame in her loss evaluation.
Generally, if your arousal goes up too high you can always "pull out" so to speak and switch to touch mode. Be careful to do this well in advance of a reversal, so you'll have time to break free before you get hit and lose mana.
For Olivia's minigame in particular, it's best to have done all training beforehand. The difficulty is a step up on purpose and is still being tuned (likely down a bit, might be a bit tough at the moment) but it's certainly possible, even at 0 stats gained, if a bit finicky.
For hers, focus on spending as much time in super-mode as you can. As long as your stats are high enough you should be fine on pleasure build up on yourself so you can focus on offense.
You'll deal some extra damage to her if you can line up super-mode with when she orgasms. If you're not up to date on your stats (I think something like 5 STR 5 END 20+ Mana was what I had, basically everything but the pregnancy training stats) then you'll pretty much have to use the super-mode's power boost to actually deal more than 1mp of damage to her.