My girlfriend's busty best friend Koiro keeps tempting me with her breasts whenever she gets the chance. She claims she loved me first and uses the kind of sex appeal my girlfriend lacks until my cock finally surrenders to the cleavage between her tits. Her devilish whisper—“Titfucking isn't really cheating, right?”—destroys what remains of my self-control. We sneak behind my girlfriend's back for daily titjobs, and once the taboo starts making everything feel even better, it does not take long for us to fall into full-blown cheating sex.