When you confess to someone, you really should make sure you're talking to the right person. In My Bride is a Mermaid, the class president pretends to be a lesbian who's in love with San after she botches a Love Confession to Nagasumi.Peacemaker Kurogane: Saitou, while he may or may not actually be interested in men (who knows with him?), is willing enough to pretend to be for information.Shimazaki in Please Twins! falls somewhere between this trope and being bisexual.Too bad Haruhi took a second to realize it.
Of course, that would take out all the Shipping. It could just be Yuki making sure they remember the shape. No-one actually explains why people saw who they did in Snow Mountain Syndrome.
Plus the whole 'heart's desire' thing in Snow Mountain Syndrome. Buuut shot down a little in that he only gets. Supported by alternate reality Koizumi being attracted to Haruhi (which may still apply in the 'real' world) and hanging out with her over it.Whether you believe him is a matter of preference, so far. Itsuki of Haruhi Suzumiya says he's this in the novels.
Rumbling Hearts - Takayuki, in Episode 1.Played for Drama later on, when the reason supplied for their "unnatural" closeness is an inability to open up to other people. Twins Hikaru and Kaoru from Ouran High School Host Club intentionally exaggerate their "brotherly affection" to cater to their twincest-loving Yaoi Fangirl clientele.Despite this, he has a girlfriend and business partner he adores (Mine Kuramae, the local seamstress and Meganekko), and his constant flirting with Shigure turns out to just be a mutual gag they use to bug people (and in Ayame's case, perhaps to discourage the family head from having sex with him). Ayame Sohma of Fruits Basket is practically the incarnation of this trope: he wears feminine clothes, speaks in a stereotypically "gay" manner, crawls into bed to cuddle with an unwilling Kyo, and constantly exchanges sexually-charged banter with Shigure that implies more than cousinly affection.