Well, it is not like you have much choice

You grip the guy's shoulders as your friend slowly pushes more and more of the plastic phallus into your ass. After the initial stretch, it kind of feels good, like you can feel the pressure of it in your ass on your clit.

You look into the guy's eyes - he is just watching your reaction to being filled up. His cock seems to get bigger as Rainie's fake dick rubs against his through the thin membrane that separates the two.

You grit your teeth as the final, thickest part of the cock slides in and Rainie stops pushing.

The two of them hold you in that position while your holes accomodate to the feeling. Rainie kisses your shoulder and that causes you to impulsively kiss the guy in front of you.

Then, they slowly start to fuck you. Your ass burns on the first couple of thrusts, but then it starts to feel good...