Έπιασα τον γκόμενο μου να γαμάει την ετεροθαλή αδερφή μου... και ενεργοποιήθηκα

My boyfriend found my stepsister coming out of the shower naked. He took advantage of the moment and fucked her in the bathroom. Since it was taking so long, I went to see what happened and ended up excitedly masturbating while she listened to her moans.