Stretching and depth training

[Vagabond-7342]

Hi everyone new to the group so treat me nicely 😊 I’ve been into anal and being pegged fairly regularly by my oh but feel like upping my pleasure somewhat I’ve started my stretching using a speculum for a few weeks on and off now but when using it how long do you suggest I use it for at any one time, I can fit a 10inch dildo all the way with a girth of around 1.5 inches so far but really would like my wife to be able to fist me in the future, any advice welcome as I’m sure there’s lots of experienced people out there tks in advance 😊