Τραντάζομαι στο πίσω κάθισμα του αυτοκινήτου ενώ η αδερφή του φίλου μου κοιτάζει

i was riding in the back seat of my friends car and in the front was his sister, i was discretely stroking it in the back, but she saw me a couple times. She saw me jerking off before.