(Twilight's recorder is being tested) Shining Armour looks at Lero again. His expression cannot be matched against those currently stored in this matrix. MATRIX UPDATING His expression is one of lust.
Twilight's attempts to extrapolate human culture from a book on interspecies courting do not go well...
Twilight: So, Lero… does your family have many enemies?
Gets a Call Forward in The Xenophile's Guide to Equestria. Twilight's mother repeatedly advises her against trying to study Lero like a science project, especially her attempt at constructing a hypothetical model of his social structure. "I just hope you didn’t do something silly like try to construct an analogue of his society by mixing up a pastiche from the descriptions in Aggie’s book."
Also from the Xenophile's Guide, the correspondence between Twilight and Celestia regarding Lero and Rainbow's relationship. Twilight mentions that Applejack is talking about a pool on the outcome of their time together, "which I think is a terrible thing to do to a friend. As such I’ve put myself down for no more than three bits on the spread." Celestia responds, ending her letter with, "This is a delicate situation, which I am sure you and your friends shall handle with same tact and sensitivity that I and my sister would surely display." Luna then writes to Twilight, asking to enter the pool with a wager of ten bits on successful consummation within a month. After Lero and Rainbow Dash get together, Twilight sends Celestia a letter, enclosing a banker's draft for Luna's winnings. Celestia is not impressed, as her response makes clear.