A girlfriend with an unusually low threshold for sex, who can easily achieve premature ejaculation and orgasm even with a boyfriend, and can have intercourse with other men's penises at any time. (Igarashi Natsu FSDSS-617)

A girlfriend with no concept of chastity, willing to have anyone's penis inserted! A boyfriend eats while listening to a deliveryman giving him oral sex! He chats with the neighbors while watching his girlfriend with a penis in her mouth. While his friend and girlfriend are having sex, she moves her hips and pants until she ejaculates, then joins her brother for a long-awaited threesome... Sex is more important than anything else! The threshold for sex is extremely low; it's a new kind of NTR.