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could pelhaps also woik as "bronies who want to peg a sister"
altho idk whaf was up wiff "Pegasister" as a term, I think I heard girl bronies use "girl bronies" 10x more often than thaf (or just bronies as gender neutral)
yeah i also heard the term pegasister around but i don't think it ever got widespread usage. also i partly didn't do sister because some definitions of pegging are specifically only a woman penetrating a man's butt, so under that logic maybe it's impossible to peg a sister (unless the sister is a guy i guess?)