"- you're not disposable! I guess I don't know if the app is going to put a tasteless little trash can icon somewhere but you're a person!"

"...Yes, but one can imagine I might be disposable relevant to this, such that you may want to gently put me back in a normal life, with or without intervening memories, and I want to strongly emphasize that such a thing would be the worst to ever happen to me.  .....Or, I don't want to emphasize it, if doing so would make you want less to keep me forever.  - I think this slider helps me to say what I mean even when I don't, mm, mean to."

"Do you want me to turn it down to the middle position?"

"It doesn't matter what I want.  If you want me to appear more restrained, then perhaps you should."

"I want you for us to get along really well, but I haven't known you very well yet so I'm not sure how to do that best!"

"I see.  So perhaps it doesn't matter."

"I'm not sure." She opens the app again to see if it has unlocked anything else recently.

It's still on the slider.  The button that based on context is clearly for closing the popup has a little lock icon instead of an X.

Ohhhh that's what it means, she can't do anything else in the app till she locks this down. Hm.

She slides it down to 65% and then locks out.

+25💕.

There aren't any other purchase options, but the app guides her to back out of Sarah's profile and into a Gifts page where she can collect various rewards.

  10💕  Today's Bonus
100💕  Completed Objective:  Collect Sarah as your friend by touching her
500💕  Collected a new friend
  50💕  Affected a friend for the first time
100💕  Gave Sarah her first Daily Gift
500💕  Developed a true friendship
750💕  Completed Objective:  Welcome Sarah as your true friend
100💕  Earned enough harmony for a friend to generate more than one heart per minute
  75💕  Unlocked your first secret action
100💕  Reverted your first action
100💕  Unlocked your first slider
    1💗  Caused Sarah to admit more about her feelings for you than she intended
  25💕  Used your first slider

When she taps the one with the different heart symbol, it gives her an additional popup:

New slider!  Affection

Oh that sounds like a good slider. Do any of these things have little info-popups if she pokes them such as "true friend" "Daily Gift" or "secret action"?

A true friend is one you can tell about "Win their LOVE With ME!" without negative consequences.

In addition to other means, you can level up your harmony with a friend each day by giving them their Daily Gift.  These are unique to each friend.

A secret action is one you unlock by completing hidden prerequisites.

Does it say in Sarah's profile what thing counted as her Daily Gift?