Your sister has a gift for your birthday. It's a gift that girls would normally want but she got it for you anyhow. It's a big long dick to suck! You aren't sure about it... but you are beta and want to make your dominant sister happy. You know it will please her and you know she will be a big brat and find a humiliating way to punish you if you dont go along with it, so you agree to suck her friends big long dick. She says you need to learn how to suck it first so she gets one of the dildos you hear her fucking herself with at night and sucks it to show you. As you watch your sister's moist pink lips slide up and down it, you can't help but imagine how that would feel on your own dick and you get super hard for her. Seeing a long cock down your sister's throat is such a turn on. She can tell you are hard and she decided to let you jerk off, but ONLY so that you can cum in your own mouth and get used to the taste of man cum. You are going to be swallowing someone else's man cum later when you suck a dick so this is just part of the training. So flip your legs back, like your sister instructs, and shoot your cum straight into your open mouth. Taste it. Then swallow your own cum! Ashley Sinclair