Shortly after "Keep Calm and Flutter On", Discord has conversations with several of the Mane 6. They do not necessarily go all that well.
Mutually Assured Embarrassment: Mature subject matter, but no actual sex. Discussion of rape may be triggering to some. Twilight has an erotic nightmare (not shown) about Discord raping her. Discord watches it and then shows up to inform her how offended he is that her subconscious mind thinks he's pathetic enough to rape ponies. Twilight wants to die of humiliation, but only after killing Discord several times.