How Does Cum Work

My stepsisters Angel and Kitty are always up to something. Its constant experiments with them theyve always been partners in crime. I guess I never thought it was weird but sometimes I swear I can hear them fucking around rubbing their clits together and scissoring each other and all that. Pretty fucking weird but Ive always just stayed out of their business. That is until one day when they approached me about needing me for one of their projects. Turns out theyre curious about how cum works and more than anything in the world they want a sample of it. Im thinking There is no way this is actually happening right But to my fucking surprise my stepsisters get on their knees and start deepthroating my cock! Where did they learn to suck dick like this And is it wrong for me to be enjoying it so much Fuck I never thought Id be dick deep in my stepsisters throat but here I am. I cant help but feel like things are only going to get way way more filthy between us now