Fif's Questions (2)

I saw a manga in which the female lead like shrinks to a dool size and ends up with her idol or her crush
Can anybody tell me the name of it

in this story a succbus/demon girl makes a app after years of work it is a app where you can use dildos and stuff on the target she makes it to ease her work for food? any idea on this one idk remember if it was a manga or manhwa