Because!

With a mouthfull of Gloria's pussy, Evan is thinking about how much she loves this and is subconciously thinking just as he did when he was doing this very thing but with a functioning hard on. As he works her over, "What does this actually feel like? A woman having her snatch licked like I am licking hers. Well, I'm determined to find out. I'm going to demand that Gloria go down on me before either one of us gets the satisfaction of penetration by any artificial dick sex toy."

"Crap! I'm actually craving cock! This isn't right. I'm a man, after all! But I now have a pussy and this is how it operates, I guess. Might as well try to enjoy it! As completely wrong as that seems."

Before Gloria has a chance to catch her breath after Evan's successful tongue lashing, "Now, please", Evan requests. "Do that to me!" He lifts and spreads his knees in anticipation.

"This should be good!" Evan surmizes, "She knows what she likes and she'll probably do that to me. I can't wait! Hurry up, Gloria!"