Due to my father's remarriage, I ended up with a stepmother who is close to my age and has enormous breasts! My stepmother suggested we go on a family trip to a hot spring. She asked me to wash her back, so we went into the bath together! Seeing my stepmother's huge breasts right in front of me made me extremely excited & fully erect! I tried to hide it while washing her back, but before I knew it, my erect penis was poking her back!? Noticing this, my stepmother seemed excited too, and she let me ravish her enormous breasts. In the end, she even allowed me to finish inside her!
