Source for the first pic?
Filenames like #####_p#.png/jpg are often from Pixiv. Source is:https://www.pixiv.net/member_illust.php?mode=medium&illust_id=76037505>>25561
Do you have a source or artist for this one?
In the dropbox link there's a subfolder called Commissions, the file is in there
Girls missing the toilet is one of my special tastes, especially if they don't bother to clean up after.
So I imagine a comic like that, where some bitchy girl does it on purpose sometimes, because she hates some other girl and it is that girl's turn to clean after school. So leave the mess for her intentionally.