My stepsister, who has zero knowledge about sex, saw me masturbating! I thought it was dangerous, but she was curious and asked, "How does it come out? Let it out one more time!" She then asked me, "Should I rub it with my hand?" and started to give me a handjob! I got carried away and told her that it would come out if I did it with my mouth, and she started to suck it with her small mouth! It felt so good that I ejaculated into my stepsister's mouth. "I really came!" she said happily. She swallowed the sperm I ejaculated and asked for more, saying, "Give me more!"