foreshadowing - and an explicit excerpt

I'm a fan of it, are you? I've used that convention quite a bit in both of my novels. I'm doing some editing tonight and came across the first explicit scene in the book, which takes place in chapter 2.

They said their goodbyes, and as he closed down the laptop, he felt his swollen cock straining against his pants. His balls were tight, aching for a release. He hadn’t had any opportunities to take care of himself since arriving on base but he was fortunate to have had some privacy for his Skype session with Maggie. He tried to imagine her watching him masturbate on webcam and shook his head, not able to envision it. He reflected on the image of her he’d just seen on the screen, her tan shoulders, the strap of her top sliding down her arm a little, the hollow space between her breasts, the happy realization she wasn’t wearing a bra. He imagined lifting up her top, revealing her small peachy-brown areolas, remembering her hard nipples and what they felt like against his lips.

He unfastened his camo pants and pulled out his stiff member, starting to imagine Maggie’s soft lips wrapping around his hardness, as if she was kneeling below him between his legs. He began to stroke himself, thinking about how urgent his need had suddenly become and how little time it was going to take for him to release. Long slow strokes, prolonging his climax for a bit, thinking of thrusting into her mouth, his hands laced through her curls, guiding her head up and down on his cock. He closed his eyes, the intensity starting to grow, the strokes becoming faster. His grip tightened as his hand moved up and down his shaft, his cock growing impossibly hard as his imagination continued playing out the fantasy behind his eyes...only suddenly his hands were laced through thick brown waves, not golden curls. The eyes looking up at him were dark brown, not light hazel. Full ruby lips curled into a smile as he pulled his cock from her mouth and spurted thick white streams all over her ivory skin, her cheek, her neck, dripping down between her lush, full cleavage.

Those lips and alabaster skin unmistakably belonged to Sarah.

What do you think?