Night crawling on people I should never touch, such as my best friend, my wife's sister, my boss's daughter, etc., and having raw sex with them.

They sneak in on people they should never mess with (Kokoro Amami, Rena Otonashi, Ren Hinami) at night, such as their best friend, their wife's sister, or their boss's daughter, and then they lick each other's genitals and have raw sex