Η ετεροθαλής αδερφή μου η Serena χύνει

we have visitors at home so my parents send me to sleep with my stepsister serena in her room but I have the habit of masturbating to be able to go to sleep so I'm masturbating on the sly but my stepsister wakes up and gets horny and decides to fuck me hard until I reach orgasm and have a squirt.