Master Series Trillium Steel Locking Anal Plug by BDStyle

Medical-grade steel expanding anal plug with keyed locking mechanism for advanced players seeking inescapable retention and complete control surrender. Expands from 4cm to 5.8cm once inserted, gripping internal walls with surgical precision until your dominant chooses release.

What it does

Insertion starts easy: the tapered tip slides past your rim smoothly as you breathe and relax into the initial 4cm girth. Once fully seated, you turn the expansion dial clockwise while breathing deeply. Steel petals bloom gradually inside you, stretching your internal walls wider than the entry point allowed, pushing against nerve-rich tissue until you reach your limit or your dominant decides it's enough.

Once the key turns and the lock clicks, you're trapped in delicious fullness. Every movement—walking, shifting position, sitting—intensifies the sensation as gravity pulls the substantial 350g weight downward. Cold steel conducts temperature beautifully; chill it in ice water for shocking insertion or warm it under hot water for gentler stretching. Glass Prostate Toys offer a different approach to internal stimulation, but this plug prioritises expansion and captivity over texture.

Specifications

• Insertable length: 10.9cm
• Initial diameter: 4cm
• Maximum expanded diameter: 5.8cm
• Material: Medical-grade stainless steel
• Weight: 350g
• Locking system: Keyed tumbler pins
• Surface: Non-porous, smooth steel
• Cleaning: Soap and water

Size and first use

Start with extensive warm-up using fingers or graduated plugs—this demands serious preparation. Cockringshop specialise in products for men and couples at all experience levels, and this plug sits at the advanced end. Apply generous silicone lube to both your body and the steel surface. Insert slowly, letting your rim adjust to the initial 4cm width. Once fully seated and comfortable, activate the expansion mechanism gradually while breathing deeply. Begin with 15–30 minute sessions, building tolerance for longer captivity as your body adapts to sustained stretching and the constant downward pull of the weight.

How to use it

Position yourself comfortably before insertion—standing, kneeling, or lying on your side all work depending on what feels right. Apply lube generously to both the plug and your entrance. Breathe slowly and relax as you guide the tapered tip past your rim, then ease it deeper until the widest part of the plug is fully seated inside you. Once you're comfortable and fully inserted, turn the expansion dial clockwise in small increments while continuing to breathe deeply. Your dominant can control the pace and final width, or you can expand to your limit if playing solo with backup key access.

After use, allow the plug to cool slightly before attempting removal—your dominant inserts the key and turns it to unlock the mechanism, then gently withdraws the plug as the petals retract. Rinse thoroughly under warm water with soap, dry completely, and store in a clean, dry place. Never use during any medical conditions affecting circulation or bowel function.

Feature breakdown

Who it suits

Advanced anal players who crave both psychological and physical domination will find this plug rewarding. It suits experienced submissives ready to surrender control completely, or dominants seeking foolproof chastity enforcement in power exchange relationships. If you need physical proof of surrender beyond what regular plugs offer, this delivers it. Solo players can use it if you maintain reliable backup key access at all times.

Skip this plug if you're new to anal play—the substantial 4cm starting diameter and expansion mechanism make it overwhelming and potentially harmful for beginners. Avoid it during any medical conditions affecting circulation or bowel function. If you play solo without secure backup key access, the locking mechanism becomes a genuine safety risk. Experienced players who prefer flexibility over rigid captivity may find the expansion too intense or prefer softer materials.

How it compares

Steel plugs are rigid with no give, conducting temperature and holding their shape under sustained pressure—they're built for serious retention and control. Slide Easy Prostate Plugs typically prioritise comfort and prostate contact over expansion and captivity. This model adds a locking mechanism and expanding petals that make escape impossible once activated, transforming it from a regular plug into a control device. If you want flexibility, softer materials, or easier removal, traditional plugs suit you better. If inescapable retention and psychological surrender are your goal, expansion and locking change the entire dynamic.

What you can use it with

Pair this with Cock Ring Sets during partnered play—while the plug locks you in place and builds internal fullness, a ring maintains your erection and intensifies sensation during penetration or masturbation. The combination of external cock ring pressure and internal plug expansion creates layered stimulation and reinforces your submissive position. Both devices work together to heighten awareness of your body and your dominant's control.

More from BDStyle

BDStyle specialises in extreme BDSM equipment that pushes psychological boundaries alongside physical sensation. Bdstyle offers other steel devices and restraint gear designed for serious power exchange and control play. Browse their full range for complementary equipment.

Read more before you buy

Before your first session, read practical guides on anal play safety and preparation. The Adultsmart blog has detailed advice on getting started—I Turned Myself Into A Butt Naked Adult Baby covers essential technique and care.

Why buy the Master Series Trillium Steel Locking Anal Plug by BDStyle

Looking for the right fit and the right material? The Master Series Trillium Steel Locking Anal Plug by BDStyle at The Cock Ring Store is genuine, function-tested, and quality-checked. We ship in discreet packaging so your purchase arrives privately. Cockringshop stocks this plug because it delivers exactly what advanced players need: surgical-grade steel, keyed locking security, and expansion that makes escape impossible. Real fit advice, body-safe materials, and plain-packaged shipping. The Cock Ring Store ships discreetly Australia-wide.