I ran into an old friend I fell out of touch with just before I went back to college. We live 1000 miles away right now cause of classes, but we've been emailing each other every other day since I left. We talk about all kinds of stuff, hugging technique, best friend drama, even stuff like deodorants and favorite bones. Her favorite bone is the clavicle (collar bone). I told her medical professionals were baffled at the shape of mine (it's shaped like a wide 'v' instead of being straight like most others). Her responses have just gotten weirder since then:
"Haha that's amazing! Now I'm curious... I'm not going to ask for a pic of you with your shirt off but I'm truly curious!! Well for the “v” thing I enjoy when the stick out so bet yours are perfect
" After this I told her I would be happy to take a picture, my shoulder is hardly scandalous and I feel comfortable talking to her about anything, and here's her next reply:
'Sorry but I still feel scandalous asking for a picture of your shoulder!! So we either need to talk about more scandalous stuff so that doesn’t seem that bad or it should just happen to show up' , she then told me about her nude drawing classes, asked if I had a girl I fancied here at college, and then sent me a text a few hours later saying 'so I checked my clavicle isn't visible at all, it wouldn't be fair to send me a picture of yours since I have nothing to offer in return 
'
How should I respond? It almost seems like she wants a lewd response given this context, but she always talks about me being such a gentleman. I don't want to scare her off, I love talking to her every now and then like this. I don't know if anything will ever happen between us though since I go to college so far away. Send her the picture? Ask for something else back?
"Haha that's amazing! Now I'm curious... I'm not going to ask for a pic of you with your shirt off but I'm truly curious!! Well for the “v” thing I enjoy when the stick out so bet yours are perfect
" After this I told her I would be happy to take a picture, my shoulder is hardly scandalous and I feel comfortable talking to her about anything, and here's her next reply:'Sorry but I still feel scandalous asking for a picture of your shoulder!! So we either need to talk about more scandalous stuff so that doesn’t seem that bad or it should just happen to show up
' , she then told me about her nude drawing classes, asked if I had a girl I fancied here at college, and then sent me a text a few hours later saying 'so I checked my clavicle isn't visible at all, it wouldn't be fair to send me a picture of yours since I have nothing to offer in return 'How should I respond? It almost seems like she wants a lewd response given this context, but she always talks about me being such a gentleman. I don't want to scare her off, I love talking to her every now and then like this. I don't know if anything will ever happen between us though since I go to college so far away. Send her the picture? Ask for something else back?