Bf has a shrinking fetish

Wondering if anyone else has encountered this. My BF loves to make my cock soft during sex and ideally make it as small as possible. He is Asian, I am white. It’s kind of a dom/ sub dynamic – not quite raceplay but he really gets off on “being the bigger man”. Lately it’s gone to a new level where he encourages me to wear a cage during sex so that I can focus exclusively on pleasuring him. Also, the cages keep getting smaller which seems to be in service of his “resizing” goals.

Curious, if anyone else shares this kink I’m pretty accommodating of bfs needs and secure in my own skin but wondering where this is taking me