Princess Diana from Fencer of Minerva naked and barefoot in sensual pose. No collar. I’ll link you my reference folder.

Eleanor fingering Velvet. Velvet's left arm does not have to be seen, but if it is she keeps the bandages on it. Otherwise both are nude. Happens in Titania. External

Matsumoto from Dissipline Zero naked barefoot and shaved showing off her barefeet

Akko bending forward holding her ankle (like reference image, but looking backward so we can see her face and butt at the same time) skirt flip and her butt is red from spanking and she is making annoyed face expression

Diana standing behind her, armed crossed, holding her Magic Wand in right hand, making expression as reference.

a flaying wooden hair brush, it's surrounded in greenish magical aura, flaying in the air behind akko butt as it spank her repeatedly .