Ah! Remember this girl. That's why sometimes, it's hard for me to give a good reply until I get an idea of the context. She was quite into you and you basically didn't have to do the massage thing when she said she can't do on weekdays. You showed eagerness and she slowly started losing attraction. Even though she was a little intrigued about the massage, you didn't really build it up well. You should have described her about how you and her would grab wine at your place first. Then tease each other. Laugh around and you'd lead her to your room after. You start off with the shoulder massage and etc. you get the picture.

The mistake you made here wasn't that you sexualized badly, just that you showed eagerness when you could have just gone for logistics and once you started the sexting, you could have gone a different route when she asked how the massage would start