me & Kayla are step-sister and are getting changed, deciding what to wear for later tonight. We are stood around in our tops and underwear in our bedroom, looking at clothes and panties to wear for tonight. As we are looking, we realise our perverted step-brother is watching us, and getting a boner as he spy's on us. We tell him to get out of our room, he then blackmails us and says if we don't he will then tell on us that we was out the other night with guys. So to keep him happy we let him watch us and wank his cock to us.