A Suzumiya Haruhi fancomic. A random thought from Haruhi causes Kyon-kun to change sex, creating Kyon-chan. Haruhi then loses all sense of control when it comes to Kyon's female body, while the rest of the SOS-Brigade has to deal with the consequences of this sudden transformation. Including some of their own. And then a male Kyon appears to make things extra interesting.See here: Tea Of SagittariusTea of Sagittarius: Kyon x KyonkoTea of Sagittarius: HerbSadly, the entire comics are in Japanese with no translation in sight. A translation has been made on the links provided!
Black Comedy Rape: One of the very first scenes is Kyonko being molested by Haruhi, or at least the before and after.
Breaking the Fourth Wall: Haruhi's rants in response to people complaining about nipples being shown. Her/the authors response is basically an explanation on how, no, nipples being shown isn't inherently sexual, so shut up.
Loss of Identity: Koizumi and Asahina of the gender version. Kyon so far seems to be more or less immune, though his/her first period caused Haruhi to lose the image of his identity she had, with weird effects.
Nose Bleed: Some epic ones from Haruhi and Asahina.
Ripple-Effect-Proof Memory: Only the SOS-Brigade, Mori-san and Arakawa are aware of Kyon's original gender. Subverted later on though, as Koizumi, Haruhi and Asahina begin to slowly lose their gender identities. Koizumi in particular is very worried about this.
Screw Yourself: Kyon and Kyon-chan. It starts with a kiss brought about by mutual antagonisment, and then moves to an experimental blowjob brought about by Kyonko's curiosity.
Single-Minded Twins: Played with to a degree. The first time Kyon and Kyonko think differently is in Herbregarding where Kyon should cum. Their argument, if anything, came from their chronic self-denial.
Male Kyon's appearance who is the Kyon we know aka John Smith
In-universe, for Haruhi it was Kyon-chan's first period. Before it she was certain that Kyon-chan was a gender-bent boy, and thus will never have periods. This was so great of a shock to her that she caused the male Kyon to appear.