I think it's pretty common for cucks to have a smaller penis. I'm just under 6 inches, and for me half the fun is when my wifes 'friend" has a bigger cock than me (which he almost always does). Even if not longer, always thicker.
like most guys, I lose the urge after I cum. Now I cum into a condom and freeze it, every time I masturbate I cum into the condom. After a month or so I have a good amount of cum that I like to suck while I masturbate.
When I was a very shy 18 year old my domineering girlfriend at the time and I decided (mainly her) to have an open relationship. She met this guy who was about 10 years older. They were obviously fucking, and when we were fucking I'd ask her about his dick and was he bigger than me, stuff like...