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The Day My Sister Let Me Use Her Mouth
Synopsis & Story
When 23-year-old Hirose Anna finds out that her little brother masturbates with her dirty underwear, she decides to take things a step further by allowing him to see her do naughty things as well. Each time the situations escalate until she comes out and tells him that as his big sister she will take responsibility for his sexual curiosity. She allows him to do anything with her except for proper sex; yet as his requests get dirtier each time, she remains determined to take responsibility and keep things going no matter what.
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Aniphoria guide
The Day My Sister Let Me Use Her Mouth: should you watch it?
At a glance
The Day My Sister Let Me Use Her Mouth has been poorly received, with an average AniList score of 50/100 — 16% of 859 ratings are 8/10 or higher.
Of the 1.6K AniList users who started it, 3.9% dropped it, so it is rarely abandoned; 1.5K have finished it.
At about 20 minutes in total, it is a short commitment — a weekend binge.
Best for viewers who enjoy Hentai — especially fellatio, netorase, incest.
The Day My Sister Let Me Use Her Mouth FAQ
- How many episodes does The Day My Sister Let Me Use Her Mouth have?
- The Day My Sister Let Me Use Her Mouth has 1 episodes of about 20 minutes each, roughly 20 minutes in total.
- Is The Day My Sister Let Me Use Her Mouth finished?
- Yes. The Day My Sister Let Me Use Her Mouth has finished airing — the final episode aired February 17, 2012.
- Is there a season 2 of The Day My Sister Let Me Use Her Mouth?
- No sequel is listed for The Day My Sister Let Me Use Her Mouth as of October 2026.
- Is The Day My Sister Let Me Use Her Mouth based on a manga?
- No. The Day My Sister Let Me Use Her Mouth is an original anime story, not adapted from a manga or novel.
- Where can I watch The Day My Sister Let Me Use Her Mouth?
- The Day My Sister Let Me Use Her Mouth is listed on OceanVeil. Availability varies by region — check the streaming links on this page.