Title: Happy Happy Osura'te Sore wa Marude Hana no Youna!
Artist: S.H
Parody: Final Fantasy XIV
Pages: 33

Artist Info

Pixiv: hoohttps://www.pixiv.net/en/users/380976
Twitter: https://gplinks.co/dfJ1A

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I don't know who came up with the romanisation of "oslatte", but I'm gonna offer a slightly different alternative. Since it's a portmanteau of オスラ ("osura") and オスって ("osutte"), which in turn are derived from the Japanese spellings of Au Ra and Miqo'te combined with オス ("osu"="male"), it makes much more sense to me to call the pairing "osura'te" in English.