Step brother's panty fetish blowjob

I cant seem to find any of my underwear so come into your room to see if you know anything. I spot some panties sticking out from under the bed and duvet. I cant believe this, your my step brother and you're getting off to my panties, some of these are even my dirty panties. I try to grab them all, but you even have them wrapped around your hard cock, this is so wrong. You come up with an idea that if we keep this as our little secret and help you cum, you will forever buy me my panties.. after some convincing I go along with it, and suck you off until you cum in my mouth and I swallow.