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Artist's commentary
Polt - Straddle Holds (Raffle Winner)
www.patreon.com/sandspire - Exclusive stories, sketch requests, art polls and WIPs (and extreme gratitude <3)
www.discord.gg/DcHwwRywrz - FitGirlFanatics server with community, artwork, photo, video sharing and more!
www.twitter.com/SandspireArt - Lots of muscle girl art.
This was part of the 1k Twitter follower art raffle posted over there a while back, one of the winners being the adorable Polt from Monster Musume No Iru Ichijou.
If she holds for ten more minutes she gets head-pats.