Erica lifts her hips up a bit, so he can thrust in and out of her, screams muffled against his mouth. Her head's racing - feverish - and she'd feel almost ill if it weren't for all the pleasure she's receiving from this.

She happier because she can crack open an eyelid and watch him, focused and full of pleasure. It makes her happy that whatever's inside of her is doing that, so she works a little harder, rougher, trying to give him more of what he wants.