It's probably going to be one of those things like, "Wait, all of you knew I was a woman all along!? And no one said anything!?!?"
"Well yeaaahhhh. I mean, it was pretty obvious since you always used the women's bathroom and slept in the women's dorms. We just never gave you a hard time over it because we all thought you had your reasons."
And of course, Dino was the only one who was oblivious to the fact.
Which, ironically, might buy even more brownie points with her. Why? Because up until he saw her naked, he bought the entire act at face value.