They are definitely Carrot's Traveling the Multiverse chapter 14 by Darklordzx

It seemed that the rumors were unfounded, The Twins were of Carrot which was a bit surprising, most of the other pony parents have offsprings that match their tribe but the Cakes were the only parents whose children were of different pony species despite them being Earth Ponies. You extended your scans around the entire pulsating organ, the pulsing walls remained still for a moment before resuming as more information flowed your mind, some remnants of sperm were scattered and dying around the organ, You found out that...
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June 2, 2023
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