Assistance Needed for Selecting a New Device

Hello. First off, please forgive my English since it isn’t my native tongue; I hope you can follow along. I’m new to the world of chastity devices. My girlfriend and I are hunting for a nice gadget suitable mainly for short sessions rather than long-term wear. Her main concern is whether she can help me climax while I’m locked up. There have been plenty of customer complaints in stores claiming that even bigger models feel too tight. So, our first purchase was an extra-large one. DARN IT, I ordered it from the German Amazon site. Sorry about that; the sizing info might be off.

Perhaps there are some Germans here who can lend a hand?:D Anyway, this device fits without needing any lubricant. On my flaccid state, it takes up only half its length. I’m actually able to get erect with it on; the shaft just gets pressed downward. Now we’re searching for something smaller. Unfortunately, the product pages don’t specify which “flaccid penis length” corresponds to what fit. They usually list the stretched/erect length, but since my shape curves a bit, that doesn’t help much. My flaccid measurement is 8cm. That should work. Maybe 9cm would be even better. I want it comfortable enough not to hurt or feel awkward when soft, primarily acting as a restraint to prevent erections (which can get painful if forced).;) I have quite a bit of foreskin. I’m unsure which method is best: leaving it forward so the penis appears longer, or pulling it back to increase thickness. We prefer pink colors, meaning no metal options. We don’t mind whether it’s plastic or silicone.

… B01HF1P9JI This one looks promising. However, as is typical with customer reviews, people complain that it’s “too small for the average guy”. The real issue: I suspect Amazon won’t accept returns on these because they count as hygiene items? If it doesn’t fit properly.