Disclaimer: I don't own anything but the plot of this story.
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Hermione knew she had to chase after Ginny. Lavender was beautiful, and clever, and cunning… But Ginny was passionate and brilliant and everything Hermione wanted in a friend, or a lover, or whatever they were to become. She wrapped herself in a towel and made it down the stairs just in time to see the portrait swinging shut behind Ginny. Silently, she cursed the girl for making her run through the halls in pursuit after curfew, drunk and wearing nothing but a towel. Still, Ginny was in pain, and there was nothing to do but to follow and try to fix things, try to explain. As she turned a corner, a classroom door slammed down the hall from her, and she ran to it. Of course it was locked, but after a few frantic spells, Hermione burst through.
Ginny was curled up on the floor, sobbing. Hermione fell down beside her, but when she reached out, Ginny pulled away.
"Don't." The ache in her voice caused a new pain to blossom in Hermione's chest.
"Ginny, please, let me explain."
"There's nothing to say, Hermione. I was wrong about a lot of things. And I was wrong about you."
"Please, I'm just confused. Lavender was making weird comments and I'm more than a little drunk, and she said she was taking a shower and I just wanted to know what she was talking about, so I followed her, and you know how hard it is to get the water the right temperature-"
"So you just hopped in and made out with her?" Ginny flared.
"No! I mean, it's not how you make it sound. She said I could join her and I still wanted to know what she was talking about and she kept asking about you and I couldn't explain and then she asked if she could 'practice" with me too, but it's obvious she was fully aware of what's really going on, even if we weren't ready to admit it yet."
"So you were confused, and you thought maybe making out with your roommate would make things clearer?"
"Ginny, I'm fucking drunk, okay?" Hermione was crying too now. "I didn't think about what was happening, and she just started kissing me, and before I could even process what was happening, you were bursting in and running off."
Hermione shivered, soaking wet and nearly naked. "Ginny, I'm sorry. You have no idea how sorry I am, and if what I do with you in abandoned hallways and broom cupboards and anywhere we can be alone is just practice, I don't think I ever want to do it for real, because I don't think it could ever be as good with anyone as it is with you."
Ginny looked up, and Hermione brushed her fingers across the tearstained, freckled face. "Hermione, seeing you with someone else hurts so much. I don't think I could handle it if it happened again."
Hermione smiled. "Then from this moment forward, I belong to no one but you."
"Promise?"
"Only if you'll belong to me, too."
Ginny looked at Hermione, tipsy, shivering, and soaked, and couldn't stand it anymore. She threw herself into the older girl's arms and they started kissing, and it felt a million times better than kissing Lavender in the shower and Ginny could taste the alcohol on Hermione's lips but she didn't care.
Hermione pushed Ginny down and started to pull away her pajamas, kissing every inch of skin as it was exposed.
"I want to make something perfectly clear," she said, pinning Ginny's shoulders down and staring fiercely into her eyes, "this isn't practice. I mean this more than I could ever mean something that happened with anyone else, and I want you more than I have ever wanted anyone, or ever will. Ginerva Molly Weasley, I want to be with you until you can't stand me anymore, but Gods, I hope that day never comes."
Ginny moaned and let Hermione continue raining kisses all over her body, arching as the older girls attentions moved lower and lower, closer to the aching heat that radiated from between shaking legs.
Ginny gasped and her eyes went wide as she felt Hermione's tongue inside her, gliding sweetly over her, tasting every inch of her arousal. Their bodies shifted until Ginny saw that Hermione had spelled away her chestnut fuzz, leaving those tempting pink lips enticingly exposed. And the taste was incredible. They lapped and sucked and kissed and bucked against each other, shuddering against the tiny vibrations of each moan until Ginny's legs started to tremble, and Hermione knew her climax was approaching. She plunged a finger in to the impossible softness, inhaling sharply as she felt the younger girl tense around her.
The tension that had been building in Ginny released in warm, vibrant waves that reached ever part of her. She could barely concentrate on what she was doing to Hermione, but the taste was so addictive she couldn't stop, even as the soft keening escaped her lips when she came.
That sweet, aching noise was enough to push Hermione over the edge, enough to send her reeling through violent, shuddering peaks.
They lay there for a while, before Hermione finally asked softly, "Think it'd be alright if I sleep over? I don't fancy dealing with Lavender again tonight."
Ginny just giggled as they stood to cover themselves and make the trek back to Gryffindor tower.