If you are determined to watch this OVA with French subtitles, here are the legitimate pathways before resorting to fansubs:
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Watching the Koneko release offers the best way to experience this title. The Japanese voice acting adds a layer of immersion that dubs often miss, and having French subtitles allows the viewer to understand the setup and "dirty talk" which enhances the experience significantly over a raw, unsubtitled viewing. If you are determined to watch this OVA
Anime Streaming Platforms: Check major anime streaming platforms for "Mesudachi" or the correct title: Anime Streaming Platforms : Check major anime streaming
Fansub and Fan Translation Communities: Besides Koneko Fansub, other groups might have worked on "Mesudachi the Animation". Look on:
Direct Search: Use search engines like Google to look for: