those Pipedream Fantasy X-tension sleeves are fair-priced and IMO good for a slim, narrow penis...even one not much wider than 1”. We have the x-tra girth version and it’s fun and a major turn-on to see (and hear) her when she’s stretched around it. It’s soft and pliant though. You do need to have and maintain a pretty reasonable erection. The insert plug inside, that provides those extra inch(es) lengthwise, is disappointing, not great or stable...AT ALL. We have the 2” version and it’s completely unwieldy. It’s basically flat where the rounded head of your penis butts up to it, which makes it lame at integrating contours (visualize a fingertip pressed up to the bottom of a candlestick). There’s your dick and then there’s the plug. They’re both contained but they don’t really connect. It’s basically this hard heavy cylinder in a quite soft and flexible sleeve.
Luckily, length is not the dimension that matters most! Honestly, I’d recommend going with no more than the 1 inch extra length plug, or perhaps even dispensing with it altogether. The “head” of the sleeve alone adds a bit more length. I do think some extenders must have better overall rigidity and connection, allowing the wearer’s penis to be better integrated with the extender. Natural Cucky’s looks rigid... more like a hollowed out dildo, like it would accomplish that, so long as he could get —and keep — it up!