My big-breasted, beautiful sister is my type! For some reason, I'm alone with her in a small bathroom!

My kind, big-breasted, cute sister came back to my parents' house for the first time in a while and said, "Let's take a bath together like we used to!" and forced her into my room! When I got in, I couldn't help but notice her breasts. Her big breasts were touching me in the small bath... I couldn't stand it anymore! I finally got a super erection! I tried to run away, but my sister found me... My sister's breasts have gotten too big!