I do not think there is anything shameful or abusive about this relationship, unlike the panels from the hentai.
She cosplays while playing piano, it's a theme that she has developed over the years. Marin wore that too in MY Dress Up Darling, and people loved that anime for that creative decision.
It does make it weird to think that she is coplaying a cosplayer.
But yea, this meme is just cherry picking to make a point.
But more importantly,
>>12329966 (OP)DOOUUUUUBLE DUUUUUUUUUUBS, yo!