Melanie sigh as she sat at your couch, plopping her enormous butt on it like she owns the place. Lifting her right leg on her left and leaning her back against the couch. "Hmph, fine, I supposed I can wait here..." She mumbled, 

Meanwhile, still unnoticed by Melanie did you get the chance to climb her legs as she sat down. Her one leg was hairy enough that you could use it as a means of climbing further and further without slipping down. 

Of course, you were also pulling her hair, it took a couple of times to climb doing it before she started feeling something on there. 

She started lifting her left leg, putting down her right in an attempt to scratch this itch.

In this one moment, did she see you?