Your butler. Beauty admired by everyone for her stoic complexion and slender figure befitting a butler. Sexy, feminine side shows in all the good places. True nature becomes overly apparent as she takes it upon herself to relieve you sexually.
There's no denying Fran's sexual interest in you. She may have angelically smooth skin and hair, but she's as whimsical and teasing as a little devil. Eventually, you can no longer resist the soft boobs she holds pride in as seductions never end.
An S-class adventurer (you) gets violated by two legendary succubi and their two clones (4 slutty succubi in total). Experience the "Square Illusion" of receiving attention from all 4 directions at the same time! You are... just food to them...
Do you prefer a quiet and kind priestess sister to have pure lovey-dovey sex with? Or will you succumb to temptation and go insane from the charms of her succubus form, which is now the physical manifestation of carnal desires?