Hi 😂 Fun question! I don’t already have an HC but I imagine boxers because he’d be shy in the locker room, then post Corneo-mission he has a fondness for silk panties but threatens to murder anyone who finds out (there’s a similar premise in an SC fic called The Plan and how it went wrong except it’s Seph: https://archiveofourown.org/works/29332233/chapters/72038463)