IENE-748 - My sister fell asleep after masturbating, so I couldn't resist and went straight for it

I was busy masturbating to my sister's videos when I found her passed out with her legs spread after her own session. Seeing her so defenseless, I lost it, started rubbing against her, and then just jammed it in. She woke up halfway through, but she was already way too turned on to even resist, so I just went all the way and filled her up.