wanderingmidget

Hypnotic Tutor Azusa is a strange onahole, because its basically a rebrand of the Umi No Ana 2. It's not even like a softer version of it. It has the exact same tunnel structure, same outer structure, exact same tunnel length (that being 5 inches/13cm) but instead of being based on a mermaid, its based on the character Ichinose Azusa from the eroge "Katei Kyoushi x Saimin ~Zettai Juujun, Wagamama JK to Haiso Tsuma o Saimin Sousa~" by POISON.
Now before buying this, I knew it had the same internal structure as Umi No Ana 2—so why did I buy it? Science... I guess, and to satisfy my curiosity. Just like Umi No Ana 2, it has 3 sections: a bumpy entrance, a groovy middle, and a tube-sh end meaning it has quite a variety of sensations.
Now when comparing the two, I feel like Azusa is ever so slightly harder than Umi no Ana 2 just because its made out of a different material, but its not enough of a difference for one to be better than the other (but Azusa is $1 more for some reason). I guess if you really hate the color blue, or a super huge fanboy of POISON, or don't like the sight of your own penis, you could buy Hypnotic Tutor Azusa over Umi no Ana 2 (or if the latter is out of stock), but if you already have the Carnivorous Mermaid, there are zero reasons to buy this. It's still a good hole for people who like high stimulation and are average length.

When looking for a firmer hole, I spotted this beauty and had my eye on her for a while. Now that I was finally able to get it, My impressions on it are very positive
The tunnel length is about 5 inches/13 cm. It has three different sections: a beginning bumpy section, a middle section that have these grooves and lines, and then an end section that's a bit more tube-like. Umi No Ana 2 is the more aggressive sister compared to the Umi No Ana 1. The hole is firm and stimulating and you'll be attacked by many sensations. Keep in mind that since it is a firm onahole, its can get rather loud, and since it is firm, if you're super huge down there, you'll want to avoid it as it gives no stretch. The greatest novelty is being able to see yourself inside of it.
Cleaning is easy and dries quick, contrary to its internal structure. If you know you like firm onaholes, you really can't go wrong with it (or the Hypnotic Tutor Azusa, the one on the left of my picture).

So pretty much any hentai connoisseur knows about uterus insertion. A feat that should *never* be attempted in real life, but you know in fantasy, logic is thrown out the window. Many manufacturers have attempted to replicate this and unfortunately, most have either failed spectacularly or the "uterus" simply acts as a vacuum chamber.

HotPowers once again attempts to make a uterus-based onahole after their first attempt left them pretty dissatisfied. The Kobukuro has an outer structure similar to holes like "Limited Potential W" and "Innocence Mujyaki Deluxe". I understand that similar exteriors can get rather 'boring' but the most important thing is the insides after all. Although my hole came out of the box with these micro tears which I fear is going to become a problem later.

Anyways, about the inside, as from looking at the pictures, the uterus is located in the middle of the hole instead of the end like how most of them are. Because of this, there feels like a lot of head stimulation going on and you can really feel yourself going through. The end has a bit of a vacuum going on making the hole have a slight cling. The entrance has a small hill to push pass.

The material is rather soft so most of the stimulation comes from inserting and exiting the uterus. You most likely won't feel much else besides it. Overall, I believe Kobukuro to be a very fine hole. It has a 6-inch tunnel (16 cm) so it's great for above-average people too. It's a pretty soft hole in general (comparable to Tomax's Soft) that is labeled as "0" which for HotPowers is their middle of the road sensation. If you want to get the fullest sensation, use the thinnest lube as possible or thin your already existing lube with a few drops of water.

Extra Virgin isn't "better" as it is very different from its sisters.
The most noticeable difference is the two points at the entrance and end. The entrance has a tight red ring and the exit has this strange "womb" and they are the most noticeable and firmest aspects of it.
The womb is strange because it has a hole in it but it isn't meant (at least I think) to be inserted in, nor is it a vacuum chamber so you just end up brushing up against it with your head or "kissing tips" with it, which does feel good.
Extra Virgin ends up being very aggressive with the base of the shaft and the head receiving very firm stimulation while the areas in between are softer while pushing through mounds, delivering smoother points. Extra Virgin is still tight, however.
It's bigger than the standard Lolinco (including crystal hard and soft skin) while being smaller than the Virgo. It also manages to be harder to clean than the Virgo in my opinion mostly because of the end. It has a little hole and corners so you have to make sure those are dry with some finger work. I would recommend buying some kind of drying tool or a high-quality microfiber towel before buying this.

Ona Cannon Mega Burst is a pretty interesting hole because it's fairly wide and soft to the touch.
The rails have a subtle texture to it that builds up in sensation the more you go at it. Each rail is positioned as such so it makes full contact and gently glides along with its vertical rails and horizontal ribbings.
It's not the most visually pleasing thing out there and the overall feeling is monotonous but it dries easily so that's a plus.
If you're a bit above average in both length and girth, its a solid choice for the smooth sailers out there. The price does hurt it a bit, however.
If you're looking for cheaper options while being a bit below average in that department, there are the Ona Cannon soft/hard and Heavens Fall Nine as they each have a similar structure.