My father remarried and formed a new family. But my stepsister is actually a super slut! If she saw my erect penis while she was dressed in a skimpy outfit, she would take me to her room with a 'Let's go to my room for a bit' and then have sex with me! And then, my stepmother saw it! I thought she would be angry, but it turns out my stepmother is also a slut! She immediately sucked my penis and got fucked! When my stepsister saw that, she was further invited and fucked... which also lit a fire in my stepmother, resulting in a strong, insatiable loop of stepsister x stepmother x stepsister x stepmother...?
