Yes, some ace people do have kinks. Being asexual just means not feeling sexual attraction towards other people; it's like being, say, a gay man in a room full of women - technically, you could have sex with these women but you don't feel sexually attracted to them and really you'd rather not. Being ace is like that, only with any and all genders.

Some ace people don't have sex at all, while others are sex-neutral (don't really see the point of sex but will do it to e.g. de-stress or make their partner(s) happy) or sex-positive (enjoy the physical feeling of sex). Sex-neutral and sex-positive aces can have kinks that make the sexual experience more enjoyable for them. Kinks are separate from attraction to people, and some kinks can be enjoyed without a partner or even without sex. So aces can and do have kinks, and this has no effect on whether they're asexual or not. :)