To your surprise Jessie takes the initiative.

Before you know it she is on top of you. her lips inches from yours and the horrifyingly realistic member resting on your stomach. "I knew it." she laughs triumphantly "You are just as much a cock-hungry slut as your sister!" before you can protest to this fact, Jessie kisses your neck. You can't help but moan, and that is probably a good thing because you would have no idea how to respond to that. Should you be insulted for her calling you a slut... or should you be insulted for calling your sister a slut.
Laying there thinking you don't even react as Jessie quickly sits on your stomach. Her massive cock, which in fairness only would have been a little large than yours until recent events, poking between the two mosquito bites on your chest that Jessie is referring to as 'tits'. You feel her hands on your head as she slowly guide your plum lips towards the tip of the veiny spear. "Don't worry {girlname} It might look a hell of a lot like cum but it isn't. That would be just unfair to you." You can't really resist in this position as your lips make contact with the tip of Jessie's 'cock'. Your lips automatically wrap around the head. letting it in you can't help yourself. You tease the tip with your tongue making sure that you make it all wet. Though as the taste hits you, you can't help but doubt Jessie. It tastes a lot like cum... Not that you would ever admit to know what it tasted like, but if you would have to guess this would be it. Though the taste is much more musky than you would have imagined. You do your best to imitate the women you have seen in adult movies... or pornos. And to your surprise it works rather well. Jessie is moaning in no time and trying to push her shaft deeper into your mouth. "Mmmm such a little cocksucker i have found for myself." Jessie laughs between her gasps and moans. "Definitely better at sucking cock than your sister." You can't help but feel a little flattered. And you are about to say something to Jessie about how she should just shut up about Sara but as you do, Jessie rams her artifical member deeper down your throat.
She is so close to your face that she needs to move closer to get more in, and the smell of her wet pussy is very clear from your point. There is no doubt. Jessie is about to cum.