Since her love of hooves spread to two of her friends, Amber and her marefriend, Rainbow Dash, had been sharing mutual feelings for them. It wasn't until Amber noticed something else about Rainbow Dash that had caught her attention-- something under her wings. Rainbow Dash also heard about Twilight's 'research' that might interest Amber, as well.

WARNING: This story includes wingpits, horn kissing/licking/sucking, slight hoofplay/fetish, reference to orgasm/climax

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Small credit to The Abyss and their story 'Horny'! I liked the idea that Rainbow Dash and Twilight had some sort of history of something like this, so it's referenced in the story! I just wanted to give credit for the idea