Sit on her lap

You get up, stroking her slick cock as you wrap your legs around her and grind your ass on her erection.

"Ooooh your ass is so hard!" Bianca coos as you continue to move your hips on her. You feel her precum on the tip of her dick, and you swirl it around for a bit of lubrication.

You line her massive member up with your ass, and slowly slide the head inside of you.

"Fuuuuuuuuck" you say out loud as the pain shoots through you. Bianca throws her head back in pleasure as you slowly work more of her inside of you.

The pain quickly turns into the good kind of hurt, and Bianca is fully inside you. You very carefully move your ass up and down, as it dawns on you that you're getting fucked for the first time!