Anna is a shy, awkward young woman who wakes up one morning to discover that she's been chosen as the new goddess of lesbian love and desire. Not only is she suddenly drop-dead gorgeous, she has a supernatural ability to attract even straight women, becoming the ultimate "I'm not gay, but for you I'll make an exception" poster girl. It's not automatic; they're not forced to fall for Anna anymore than for any guy they might meet, but with Anna looking as good as she does, falling for her isn't exactly hard. As their attraction blossoms and they grow closer to Anna, women (straight, gay, or bi) become more and more beautiful, and (if straight) more attracted to women in general. Not only that, but every bond of true love Anna forms with another woman, she grows in power and beauty, and gains a new supernatural gift or divine ability. Eventually, she may develop the ability to bless her lovers with divine gifts of their own.
Here are a few examples of how the story could start:
Scenario A: Anna is a plain, nerdy girl, studying classics at a prestigious women-only college. She doesn't have a lot of friends, and most of her social contact comes from the time she spends tutoring the other girls in her dorm. Becoming a goddess doesn't make her any less shy or awkward, and at first she has no idea how to handle her fellow students not just noticing her, but falling for her, even as they grow into stunning beauties themselves. How long will it be before the entire floor becomes one great big polyamorous lesbian relationship with Anna in its center? How long until the entire dorm follows suite. The entire school? Like it or not, Anna is about to find love in a big way.
Scenario B: Anna is a starving artist working at a coffee shop to pay the bills. She figures that her sudden growth spurt can help her bring in more tips, but she has no idea what she's in for. Almost overnight, the shop becomes very popular with a lot of attractive young women, and Anna can't help but notice that they seem to be growing even more beautiful every time they visit. Not only that, but suddenly more and more of her female co-workers are acting (and looking) very nice to her, and seem interested in building more than just professional relationships. How will Anna handle suddenly become the center of attention, as the unassuming little coffee shop suddenly becomes the hottest lesbian hangout in town?