SONE-754 Review: I’m Horny for My Girlfriend’s Sister Shino Mayu’s Huge Tits

SONE-754 stars Shino Mayu in a “Girlfriend’s Elder Sister” storyline, though it’s not the slutty seducing trope that you see in most JAV movies. Here she plays a shyer character which suits her perfectly as she weakly accepts her sister’s boyfriend’s request to play with her big tits. The movie has 4 scenes all with lengthy titty fuck segments, and 2 of them have a titfuck cumshot.
Table of Contents
TF = Titfuck, AJ = Assjob, TJ = Thighjob
Movie Details

Movie Name | 彼女の姉の生着替えを覗いたら…モノ凄い巨乳ボディに性欲即発!天然で 無自覚で 押しに弱い お姉さんに本気でお願いしたらヤラせてくれました。 SONE-754 When I Peeked At My Girlfriend’s Sister Changing Clothes… I Got An Instant Sexual Desire For Her Huge Breasts! She’s A Natural, Unconscious, And Weak To Pressure, So I Asked Her Seriously And She Let Me Do It. |
Studio | S1 NO.1 STYLE |
Release Date | 10th June 2025 |
Pinching Finish (挟射回数) | 2 Titfuck Cumshots (2 パイズリ挟射) |
Movie Review
Scene 1 – Titty Fuck + Sex

The first scene has the guy walking in on Mayu who is changing out of a wet T-shirt, and pleading to see her tits. Once he got a look at them he lunges at them like a hungry baby. This scene has close to 8 minutes of paizuri, but sadly it goes into intercourse where he then finishes on her tits.

Performance (演技) | |
Eroticism (エロ度) | |
Pinching Technique (挟むテク) | |
Finish (射精度) | |
Average
|
Scene 2 – Titty Fuck (1 TF Cum)

Scene 2 takes place at Mayu’s front door where the guy confesses his lust for her and wants her right then and there. From there it’s just 10 straight minutes of titty fucking to completion. Not exactly ideal for me as Mayu-chan still had her bra on. Still the way she clasps her tits together at the end was great and looked super tight, but at the expense of the cumshot which was completely buried inside her cleavage.

Performance (演技) | |
Eroticism (エロ度) | |
Pinching Technique (挟むテク) | |
Finish (射精度) | |
Average
|
Scene 3 – Oiled Titty Fuck + Sex

Scene 3 has more incredible-looking paizuri from Mayu, this time even with her being fully naked and oiled up. Sadly this was another intercourse scene that ends with a cumshot on her ass.

Performance (演技) | |
Eroticism (エロ度) | |
Pinching Technique (挟むテク) | |
Finish (射精度) | |
Average
|
Scene 4 – Titty Fuck + Sex (1 TF Cum)

Thankfully they saved the best for last. By the final scene Mayu has also fallen for the male character and is now dictating the action. She even asked for more after getting a titfuck cumshot out of him in the middle of the scene, which he certainly gave which led to an intercourse segment ending with a facial cumshot.

Not the best titty fucking out of the movie, but still plenty serviceable with her skimpy bra and in my favored position. The cumshot wasn’t as strong as I would have liked, but at least it was visible with Mayu-chan keeping her tits apart unlike the previous money shot. Her continuing to pump him even harder post-orgasm was also a nice touch.

Performance (演技) | |
Eroticism (エロ度) | |
Pinching Technique (挟むテク) | |
Finish (射精度) | |
Average
|
Summary
Overall a very enjoyable movie from Shino Mayu with a nice story to go with it for once, considering the previous releases she’s had. There’s close to 30 minutes of pure titty fucking in here, and it’s a damn shame that S1 rarely allows fake cumshots. Mayu-chan still hasn’t had that one scene where I would go back to again and again, but when it (hopefully) comes, these will be some excellent “supplementary material”.

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