In Chapter Two, Yvonne is arrested and taken to Stonemuir Psychiatric Prison. Sort of a Broadmoor meets Arkham style hellhole for Supervillains, and a lot of the fun I have with Yvonne is finding new ways to use her powers. Unfortuately there is too much light, and she's set to wear a LED collar and set of cuffs so no manipulating darkness into weapons, no summoning nightmares, no becoming unnoticeable (as opposed to invisible.)
But... her powers are conceptual in nature, not just using literal darkness, she has a domain over dreams and the unconscious, seeing people's hidden desires even before they know what they really want. She can know things about people that they wouldn't tell anyone else, the kicker is she often doesn't know they keep it a secret, and can tap into the collective unconscious like people use the internet to learn things.
She didn't do that to learn piano, the ward just happened to have one with a few books on how to play and she's going to be there for a while: it was realizing she could do this, that any song on the tip of the tongue of her fellow inpatients she could figure out what they wanted they heard so long ago, along with the lyrics.
The atmosphere growing far less tense and people opening up about the songs that get them in that villainous mood. Going from Elbow 'Leaders of the Free World' for the older former villains, to MCR's 'Teenagers' for the younger inmates, and more...
Naturally, the staff and higher-ups aren't impressed.