I'm looking for some durable inflatables, preferably for two. I love Messygirl's blue chair, but I really need something that is wide enough for two sets of legs. Any suggestions?

We put three people in a 7'x4' inflatable pool and it worked nicely, or its a generous space for just two.

First pic, Rosemary and Lady Jennifer share a water and foam pool.
Second pic: Rosemary, Chastity, and Fidelity share the same size pool with gunge.
Third pic: The type of pool we use, available from just about any supermarket or DIY store in the spring/summer, or catalog stores all year round.

We tend to replace them due to air leaks every few months hence the dfiffering colours in the pics but both pools were the same size, basicallty 7' long x 4' wide. In the UK they usually cost £20 - £30 each.

I use the same - serves very well. I think that sized ones are more robust than the smaller toddler ones. I haven't punctured it yet, despite some lively activity with 2.

Yeah, the pool may be the way to go. Have you ever tried putting foam tiles underneath?

When USA last year we use one from Amazon and it very good and even had blow up seat use as well

Where can the blue chair Messygirl uses be found?

Smooth PVC inflatable chairs seem to have gone out of fashion- you can find plenty of flocked ones. The one I found was listed under pool supplies rather than furniture.
"Inflatable bondage chair" seems to give some good results.

Brought my inflatable pool off amazon- Umi brand 2mx1.5mx0.6m, the prices tend to be all over the place so browse about and grab one on discount. (Seen them listed for £18 and £75!)
Worked well for about 2 years for myself and my partner (intermittent use)

Getting one with higher sides can help a lot with keeping mess contained in the pool.

The best time to pick up these pools is late summer/early autumn when retailers have their summer stock on clearance. Likewise as we're moving into Spring the prices are starting to climb on these products.

It can be found on my wishlist

https://www.amazon.com/Solstice-Swimline-Cooler-Inflatable-Lounger/dp/B001790LVQ

I got this small inflatable pool for $6 off Amazon and had some messy fun in it this weekend! Put a tarp over it to make clean up easier. Worked great