This is shown off screen, but i figured premise would amuse some.
From the anime, Seirei Tsukai no Blade Dance
From ep 12, about around 17:20
It involves the Head of well magic girls school, in this ep is very feared woman called dusk witch, she for reasons I won't spoil, decides to punish a rogue witch or sororcess in very sadistic way, by feeding her to monster of some kind.
The scene in question unfortunately happens off screen and not particular shown but looks like floating blob or something when comes at her.
You Do hear the thing voraciously devouring her and girl screaming though.
It eats girl off screen, but fact dusk witch seems get off on it, and her well hungry gestures makes scene amusing.
http://www.animeflavor.com/seirei-tsuka ... episode-12