A diaper kink is indeed a thing.
Lots of people have a diaper kink and are into diapers sexually.
If you get aroused by diapers then you have a diaper kink also known as a diaper fetish which is normal and okay.
Many people have a diaper kink or diaper fetish and get aroused by wet or even dry diapers.
Some people also have a kink where they want to be a toddler or baby and have someone take care of them as a toddler or baby.
I'm not only into wearing diapers sexually but I also love to regress to a baby and toddler age and drink from bottles, sippy cups, wear bibs sit in highchairs, suck on pacifiers etc.
I also love playing with baby toys and playing outside on the slide, swing etc and in my own yard I love to play on the swing and slide wearing just a diaper and shirt and shoes.
It makes me feel so little like the toddler I used to be.
I used to play on the slide and swing wearing just a diaper, shirt and shoes and doing so again makes me feel that little again.