The natural conclusion

You slowly hunch forward and slide your hands around her hips, up over her stomach and cup those glorious tits. Erin reaches back and wraps both her arms around your head as she raises her upper body. "mmmm you like my breasts don't you John, feel them, squeeze my tits". They're so heavy and full in your hands. The large nipple pressing into the middle of each of your palms. Erin seems to like what you're doing too as she starts to hump her pussy back onto your cock.

You use those wonderfully soft pillows as leverage and meet her rhythm once more. Your chin is on her left shoulder, but she's still looking to her right at the pair of you in the mirror. It's obviously turning her on even more watching you in the mirror and she really starts to ride your cock. "Just look at you fucking me, feels so good you filling me up, God I love cock, your cock."

Her soft body conforms to your own with every stroke. Her rhythm picks up and you strive to match it, driving her harder, making her gasp and moan. "Yeah Erin, yeah gonna make you cum so hard baby." You're squeezing and pinching her nipples, fondling her bouncing tits, loving the way they fill your entire hand with every jiggle. She's tossing her head around and arching back against you, bouncing her knees on the bed as she rides you up and down. Your cock just ploughs into her moist, wet tunnel over and over. Her head arches back, her breaths are coming in long loud moans. Your cock starts tingling all over sending sparks up your spine. Erin must be feeling the something similar as she sucks in one large breath before letting out a wild panting scream. Her pussy grips you like a vice but is so slick you somehow manage to keep pumping away as she sends you over the edge. Your balls send stream after stream shooting into her depths. Her pussy is back in milk mode and the feeling is enough to take your breath away as it works every last drop out of you.

She loses balance and you both topple forward. This drives your cock as deep as you’ve been, butting against her cervix. She lets out a muted scream, but continues to milk your cock with her pussy as you both pant to get your breath back. "Damn Erin... that was incredible", you finally say, absent-mindedly fondling those delectable breasts. "It was everything I imagined it would be", she sighs contentedly.