"ЭЙ, Я ВИДЕЛА ТЕБЯ!" Я обнаруживаю, что она мастурбирует, и в конечном итоге я заставляю ее кончить

One afternoon, after arriving home, I proceeded to enter the study wanting to research something on the computer. When I opened the door, I was so surprised to find my stepsister uncontrollably tormenting herself. The unexpected thing was that she discovered me watching her and invited me in.