Stacey cums just from it sliding into her

"Ugh, Stace!" You groan as your naked, yoga instructor girlfriend squats down onto your giant new dick.

"Mmmmm, Finn!" Stacey calls out your name in return, her eyes crossing in pleasure as she slides deeper onto your shaft.

Stacey works you in slowly, making little movements up and down as she lubricates and gobbles up your monster cock. Her tight pussy folds press against your sensitive cockhead causing you buck involuntarily, suddenly vanishing another inch inside of your girlfriend.

"Aah!" Stacey squeals. "S-s-so m-m-much d-d-d-dick!" She shudders up your length with a micro orgasm.

"Sorry babe, you just feel so good!" You grab onto her quivering hips and grip them tight. You notice that Stacey's stomach is a little distended from all of the cock currently buried within her.

"Don't apologize. This diiiiiiick feels soo good!" Stacey moans and runs her hands up her chest and through her hair. "Don't get me wrong babe, your normal cock did the business, but this new one? Uuuuuugh! It's reaching me in places that have never been touched before!"

You're not offended, knowing that it was the marker's influence talking. In fact you're a little proud to be able to elicit such a response out of your girlfriend.