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

[Popcorncake]

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

Updates

+1 y

Does anyone else have thoughts that might be able to help me out?

[teawrecks]

Don't assume you were the only one she sent that to? Just sayin. It was snapchat, there's a high chance she sent it to multiple people.

I woke up to a snap of a dudes dick this morning saying he missed snapping with me. Do I assume I'm the only one he sent that to? Nah. Was it still flattering? Little bit.

[Popcorncake]

Thanks for your input

[CHARismatic110]

She was basically sending out the bat signal. She was probably horny and wanted you to show her some attention.

[Popcorncake]

In that case I most likely screwed up xD
I was shocked to see a picture like that coming from her, so for some reason and I don't know why I screenshotted it. Realizing what I had done I became really ashamed (which I still am a little bit) so I removed it immediately and begged her for forgiveness to which she responded with something like "Hahahaha no no it's okay <3<3".
I really appreciate our friendship and don't want to betray it in any way.

[CHARismatic110]

Well you should probably not screenshot snaps but since she was ok with it then don't worry about it.