"Just a little dawdling...it should be okay, right?" Unable to resist her younger brother's morning erection that revealed his penis...she ejaculated without a condom at the last moment. Her rationality erupted, and the busty older sister, Chisaki Chinatsu, repeatedly performed a slow piston-like riding position. (ROYD-329)

My sister woke me up, and when she pulled back the covers, she found my penis exposed in a morning erection! Faced with this long-awaited unprotected erection, my sexually frustrated sister, trying to keep me from waking, quietly straddled me and rubbed her unprotected vagina against me to release her desire! However, the moment I woke up, she slipped in and ejaculated inside me without a condom! Then, as if savoring the long-lost pleasure, my sister began a slow, piston-like riding position! Having gradually lost her rationality after accidentally seeing my exposed penis, my sister became even more extreme!