Role-playing in the bedroom can be naughty fun—anyone who’s ever played doctor-and-patient, or pretended that their partner is a stranger to enact a random pickup scenario, can attest to that.

While the above forms of role-play are fairly common, another type of make-believe, age play, resides in the fringes of Fantasy-Land. Still, the practice of getting one’s kicks by not acting one’s age has plenty of adherents.

Often, the practice involves a grown-ass adult acting like a big baby. But as Mistress Mercy, a professional dominatrix based in Florida, explains to HUSTLERMagazine.com, age play can take multiple forms.

“Age play is a form of role-playing in which consenting adults pretend to be older or younger than their actual age,” she says. “Any age can be portrayed, from infancy to the elderly, and it often includes appropriate clothing, speech and behavior of that age group.”

Mistress Mercy primarily offers BDSM services, but she also provides age play sessions where she plays the role of a caregiver to “littles,” who role-play between the ages of 3 to 10, and “adult babies.”

“I love the sweeter, softer, emotionally rich and more playful control of the dynamic between a Mommy Domme and a little boy, as well as the creativity of immersive scene crafting,” Mistress Mercy enthuses. “For me, the taboo of age play and the Mommy-and-son roles are both fun to explore and very erotic!”