I'm your twin sister and we're both getting really curious about sex so we decide that it's best that we start learning together. You show me your penis and I show you my little kitties and pussy. We're both so nervous but so turned on at the same time checking out each others naked bodies. I start playing with your penis and we decide to move the experimenting further have sex even though we have no idea how to do it. You put your penis inside me and it's a bit uncomfortable but you keep moving around until it feels good and you fill me up with a bunch a thick white stuff!