While his girlfriend was away on a trip for three days, he was pursued by her busty younger sister and couldn't resist his desires, indulging in forbidden pleasures. (Mori Reina CAWD-334)

I'm such a foolish man... "Finally, I can be alone with you!" My girlfriend had just gone on a trip, and Reina (my girlfriend's younger sister) tempted me with her G-cup breasts... Her ample bosom, which my girlfriend didn't have, bewitched me... The forbidden relationship only fueled my excitement for having an affair. My girlfriend kept insisting on using condoms, but with Reina, I could penetrate her directly... I was already hopelessly addicted. "My sister will be back soon..." In the limited time we had, I kept demanding ejaculation inside her, indulging in sex.