Relationships

This girl sent me a picture of her butt late at night, what does it mean?

To some of you it may seem obvious, but to me it is not because our relationship is very complicated.
Me and her don't really live close to each others, we rarely talk to each others in person or with our voices, but we do chat a lot. We even used to do PG13 sexual roleplay, but that was a while back. And with that comes occasional flirting. This has been going on for more than 2 years. Suddenly in the middle of the night she sends me a picture of her butt in her underwear, her sitting arched on her knees on her bed with text saying "Big bed but no company?" on snapchat. Her wanting me to acompany her under a blanket or similar being cosy is something she has hinted at before.

I haven't really thought about what we are to each others before. What do you think?
Feel free to ask for more details
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Does anyone else have thoughts that might be able to help me out?
This girl sent me a picture of her butt late at night, what does it mean?
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