My girlfriend, who was dating me with marriage in mind, was secretly seducing my senior and having an affair. "If I just sandwich your cock between my breasts, it doesn't count as sex, right?" she said with a mischievous smile, cunningly tempting him while making sure her oblivious boyfriend wouldn't find out. Trapped between her soft, bouncy big tits, resistance became impossible. Behind her fiancé's back, she passionately begged for creampie sex, diving into intense, illicit intercourse. "I promise I won't cause any trouble—please fill my pussy with your sperm," she pleaded with innocent words, drawing him deeper into their forbidden relationship.