Under where his hand had been formed the words, 'Humans turn feral when they have sex'. Tanya laughed a little. "I knew you had a bit of a petplay kink, but damn!" she said to Max.
"It's gonna be cool to see how it fits in with mine, too," you say. "You're gonna have a fun time from now on," you tell Tara teasingly, and she laughs back at you. You have to admit, it does sound like fun- once or twice Max has gotten you to try petplay stuff when you've gotten with him, and you're not as into it as him but you do still enjoy it. So the idea of all the conscious awkwardness getting removed from sex, and focusing on the instinctive pleasure, should probably be really hot.
"Looking forward to breeding us and stuff?" Max says, continuing to tease Tara.
"C'mon guys, no need to get this horny about it," she replies.
"Look who's talking? You have to put your hand to it and enter your fetish now," you point out.
She mock-sighs, and places her hand on the stone. When she removes it, her fetish is inscribed on the rock, and you and Max see what it is...