Tell him to get naked once he's decent

"Whatever helps you sleep at night, bro. Just hurry up and think of something gross so you can get soft enough to ditch the suit. It seriously smells awful and I don't think I can sleep next to that."

Sure, you enjoyed what you two did in junior high. It was fun, and there's nothing wrong with harmless experimentation. But it was definitely a one-time thing, and you are more than satisfied fucking your female companions.

"Fine. But only if you admit my dick is bigger."

You grin and pull out your best (admittedly still shitty) Yoda impression. "Bigger, your dick may be, but size matters not."

Will laughs at your reference to the old sci-fi flick, and after a couple minutes of quoting Star Wars back and forth, he finally pulls off the suit and stows it outside. The change in smell is immediate, and despite the awkwardness of the proximity of your naked bodies, you are both soon fast asleep.