The Reptile and Rarity

Sludge and Twilight had just finished having some rather rough sex, unaware that Spike had witnessed the whole thing. Rather than feeling disgusted, Spike was somewhat interested because he knew how sex worked the pony way but Sludge had yet to show him the way that a dragon has sex... it looked a bit forceful all things considered. Spike was undeterred however, so the very next day when Sludge lumbered out of the bedroom and Twilight was still recovering from the hard pounding she had received, Spike immediately went up to him and said "Dad... can you teach me the dragon way of having sex?"

Sludge looked at Spike with shock and said "Um... Spike, I'm your father... plus, I'm not really that way inclined so..."

Spike clarified and went "No no no no, I mean... like, can you show me how a dragon would fuck a mare that he likes?"

Sludge breathed a sigh of relief and went "Phew! You scared me for a second there, sure I could show you, you'll have to watch from some kind of hiding place but I could show you how we dragons do it. Who did you have in mind?"

Spike bit his lip nervously, he knew exactly what would be happening if he said this pony's name but if he wanted to love her like a real dragon would then he figured he could live with Sludge's teaching method this one time. Spike took in a deep breath and said, very confidently, "Rarity".