Kaguja-sama wa nugasetai / Kaguja-sama wa dasasetai / Širogane Mijuki wa jomasetai / Kaguja-sama ♡ aquarium (S02E07)

Ishigami has a biased opinion that "Guys who wear boxers are all man whores." Kaguya takes his words to heart and is dying to know what kind of underwear Shirogane is wearing. She tries to come up with different strategies so that she can take a peek at his underwear without it seeming weird, but all her ideas are too naughty. She decides to ask him directly what kind of underwear he likes, but Shirogane misunderstands the question and thinks she is asking him what kind of lingerie he is into. Shirogane starts to imagine the kind of underwear that he wants Kaguya to wear. (Crunchyroll)