Well, if it's never before occurred to Adora that you can put your mouth on someone else's mouth, putting your tongue on someone else's tongue is definitely a brand new concept. She wasn't expecting it one bit, and the unprecedented contact startles her, forcing a thin, high-pitched gasp. But-- even as her face twists up-- she leans into it anyway, because she told Catra she wasn't going to flake out or freak, and she's not gonna go back on her word so easily.

Catra's mouth is hot, but her tongue oddly cool, its sandpapery texture all the more noticeable when pressed over Adora's own, smooth tongue. The friction between them is new, buzzing, strange -- makes her lips twitch and her throat tighten, and in the midst of it all, Adora nearly forgets how to breathe.

But she doesn't even think about breaking it off. Not with Catra's purr thrumming all the way up to her tongue, with her fingers stroking sweet reassurance into her skin. Catra's pleasure traps her. She can't pull away.

By the time their lips finally part, Adora's lungs itch and her face burns, and the first thing she does is suck in a mouthful of air. The second, is wheeze out:

"Where did you learn that?"