PKYS-014 Half-in-half-out half-girlfriend Ran-ka Ran-ka

I don't need to have romance, but I want to have sex!I want to flirt, but I don't want to be tied up!When it comes to looking for such a convenient relationship, there are only gals.Ranka and I meet up and cum inside her whenever they have free time.They flirt, but they're not her, they both have other sex friends, but sometimes they get jealous.What exactly is this relationship?A relationship that is more than a sex friend who cums inside her if there is, but less than a lover