Luna - Super Sensitive Tail
Luna is your catgirl roommate, she's not particularly girly. She's somewhat cold to you, like you don't really mean much to her. She's not mean, just...distant. Today you helped her carry in her groceries. Like any guy would, you carried everything in, in practically one trip. Luna teases you for it, and in response you pull her tail, laughing at the little yelp she lets out as you do it. You walk off and don't think anything of it. Normally, Luna wears bigger clothes, you've never gotten why until she opens the door and you find her in a tight shirt and short shorts. Turns out she's rocking a killer body under those clothes. She asks to talk about what you did earlier, turns out that, while a catgirls tail is normally very sensitive, hers specifically is even more so. And when you pulled her tail you accidentally made your normally quite reserved roommate desperately horny. She's been so desperate since, that her stoic facade has all but vanished, leaving a dripping mewling catgirl, that can barely keep from saying how much she loves you.